How Old Is She, Her Mum, And Her Dad? - Forum Games (5)

How Old Is She, Her Mum, And Her Dad? - Forum Games (5) - Nairaland

Nairaland Forum › Entertainment › Forum Games › How Old Is She, Her Mum, And Her Dad? (42573 Views)

Re: How Old Is She, Her Mum, And Her Dad? by ifada123: 12:50am On Apr 08, 2019

ePlanet:
Let Nina's age be denoted with x, her mum's denoted with y and her dad's z

From the questions,

y= 2x....... Equation 1
y + 5 = z...... Equation 2
x+ y +z = 100 ..... Eqn 3

Substituting eqn 1 into eqn 2 for your

2x + 5 = z..... Eqn 4

Substituting for eqn 4 into eqn 3 for z

x + 2x +2x + 5 = 100

Adding items with x

5x + 5 = 100

Subtracting 5 from both sides,

5x = 100 - 5

5x = 95

Divide both sides by 5

x = 95/5

x = 19

Substituting 19 for x in eqn 1

y = 2(19)

y = 38

Substituting for x and y in eqn 3

19 + 38 + z = 100

57 + z = 100

Subtract 57 from both sides

z = 100-57

z = 43

Recal that x denotes Nina's age, y her mum's and z her dad's.

Therefore,

Nina is 19

Her mum is 38

Her Dad 43

Math and physics. Best subjects ever! And, of course ,English.

Try this sir
Solve
(√2 +1)^x +(√2 -1)^x=34

Re: How Old Is She, Her Mum, And Her Dad? by ePlanet: 1:13am On Apr 08, 2019

ifada123:
Try this sir
Solve
(√2 +1)^x +(√2 -1)^x=34

is the sq rt covering everything in both brackets?

Re: How Old Is She, Her Mum, And Her Dad? by ifada123: 1:55am On Apr 08, 2019

ePlanet:
is the sq rt covering everything in both brackets?

The square root is covering only 2

Re: How Old Is She, Her Mum, And Her Dad? by Samizaya(m): 4:55am On Apr 08, 2019

100 - 43 = 57 , 43 - 5 = 38 & 38÷2= 19; Therefore 43+38+19=100, So the child is 19 yrs old

Re: How Old Is She, Her Mum, And Her Dad? by IamPlato(m): 7:17am On Apr 08, 2019

UyaiIncomparabl:
God. I hate mathematics!

Olodo In School Those Days Spotted!

Re: How Old Is She, Her Mum, And Her Dad? by Youngjohnosas: 7:37am On Apr 08, 2019

Offpoint:
Dull people like us wey dey dey back seat when we see math question on board we....do the below picture

God bear me witness I don't know what the hell those guys above are writing, small thing dem don carry X enter the matter...

but the girl na idiot sha

the reasons I still have my money in the bank is because there's no X in banks

I tire o boss, the intimidation nor b here.

Re: How Old Is She, Her Mum, And Her Dad? by Mutemenot(m): 8:04am On Apr 08, 2019

momove4real25:
God bless u for putting smile on my face bfre bed time

One love

Re: How Old Is She, Her Mum, And Her Dad? by yarnme2(m): 8:42am On Apr 08, 2019

frankomale1:
A girl went to school and the teacher asked, how old are you? She replied I don't know but I know that I'm half my mother's age.

The teacher asked OK how old is your mother? She said I don't know but I know that my dad is 5 years older than my mother.

The teacher, then asked how old is your dad? She said I don't know but I know that if we add our ages the answer is 100 years...

Now, how old is the girl, her mum, and her dad?

Please show your workings!

Girl = x
Mother = 2x
Dad = 2x + 5

- Girl + Mother + Dad = 100
- x + 2x + (2x + 5) = 100
- 5x = 100 - 5
- 5x = 95
- x = 95/5
- x = 19

- Girl = 19
- Mother = 2 x 19 = 38
- Dad = 38 + 5 = 43

Re: How Old Is She, Her Mum, And Her Dad? by ibk4God(f): 8:43am On Apr 08, 2019

CodeTemplar:
Let daughter's age be d
That makes mom's age 2d and dad's own 2d+5
d + 2d + ( 2d + 5 ) = 100
d + 2d + 2d +5 = 100
5d + 5 =100
5d = 100 - 5 = 95
d = 95/5 =19
daughter's age is therefore 19 and mom's is 19 X 2 = 38 and dad's is mom's own + 5 and therefore 43
19 + 38 + 43 = 100

I Like the way you break it down. Thumb up!

Re: How Old Is She, Her Mum, And Her Dad? by mechanics(m): 9:05am On Apr 08, 2019

ShyWhale:
19,38,43

you are right.

Re: How Old Is She, Her Mum, And Her Dad? by mechanics(m): 9:07am On Apr 08, 2019

Bizmagnet:
Let mother's age be x, then the girl's age will be x/2 being the half of her mother's.
Since the father's age is 5 years greater than the mother's, his age will be x+5.
According to the girl, the sum of their ages is 100. Therefore,
girl's age (x/2 years)+ mother's age(x years) + father's age((x+5)years) = 100.
Now, x/2 + x + x+5= 100
2x + x/2 = 100-5
2x + x/2 = 95
4x + x = 190
5x = 190
x = 190/5
x= 38.
Therefore, the mother is 38 years old, the girl is 19 years old and her dad is 43 years old.

In other news
Do you need a website/blog/software today? Contact me through my signature to get the best and the affordable.

mathematician, I can remember that solving in my junior secondary school days.

Re: How Old Is She, Her Mum, And Her Dad? by Nobody: 9:07am On Apr 08, 2019

IkpuMmadu:
The clue is there. . Didn't you go to school
Girl = ½ of mum age
Mum is 5 years lesser than dad

Divide the mum's age by 2 = girls age
Add 5 to mum's age = fathers age

It's deduction

The clue is if you were my student I will reduce your mark. Instead of 10/10 you get 6/10

Re: How Old Is She, Her Mum, And Her Dad? by fippycbk(m): 9:45am On Apr 08, 2019

masterpiecer:
Na so.
After dem don help u find d ansa finish

Lol. I wanted to solve it but people had already done that. It's still basic algebra. grin

Re: How Old Is She, Her Mum, And Her Dad? by TourismMan(m): 10:30am On Apr 08, 2019

Toseenlove:
Your dullness na follow come be dat lol.

Lol

Re: How Old Is She, Her Mum, And Her Dad? by ImaIma1(f): 10:42am On Apr 08, 2019

Bizmagnet:
Let mother's age be x, then the girl's age will be x/2 being the half of her mother's.
Since the father's age is 5 years greater than the mother's, his age will be x+5.
According to the girl, the sum of their ages is 100. Therefore,
girl's age (x/2 years)+ mother's age(x years) + father's age((x+5)years) = 100.
Now, x/2 + x + x+5= 100
2x + x/2 = 100-5
2x + x/2 = 95
4x + x = 190
5x = 190
x = 190/5
x= 38.
Therefore, the mother is 38 years old, the girl is 19 years old and her dad is 43 years old.

Mathematician. Nice

Re: How Old Is She, Her Mum, And Her Dad? by oloriLFC(f): 11:15am On Apr 08, 2019

masterpiecer:
What then is ur tin?

Re: How Old Is She, Her Mum, And Her Dad? by skedy1(m): 11:16am On Apr 08, 2019

Joystark:
Na una dey intimidate person dat year with calculation.

Thumbs up man.

Haha.. I swear!

Re: How Old Is She, Her Mum, And Her Dad? by mozele(m): 6:12pm On Apr 08, 2019

Bizmagnet:
Let mother's age be x, then the girl's age will be x/2 being the half of her mother's.
Since the father's age is 5 years greater than the mother's, his age will be x+5.
According to the girl, the sum of their ages is 100. Therefore,
girl's age (x/2 years)+ mother's age(x years) + father's age((x+5)years) = 100.
Now, x/2 + x + x+5= 100
2x + x/2 = 100-5
2x + x/2 = 95
4x + x = 190
5x = 190
x = 190/5
x= 38.
Therefore, the mother is 38 years old, the girl is 19 years old and her dad is 43 years old.

In other news
Do you need a website/blog/software for your business, company or ideas today? Contact me through my signature to get the best and the affordable.

u Don y teach me maths today

Re: How Old Is She, Her Mum, And Her Dad? by mozele(m): 6:13pm On Apr 08, 2019

CodeTemplar:
Let daughter's age be d
That makes mom's age 2d and dad's own 2d+5
d + 2d + ( 2d + 5 ) = 100
d + 2d + 2d +5 = 100
5d + 5 =100
5d = 100 - 5 = 95
d = 95/5 =19
daughter's age is therefore 19 and mom's is 19 X 2 = 38 and dad's is mom's own + 5 and therefore 43
19 + 38 + 43 = 100

thanks for the elaborated solvings sir

Re: How Old Is She, Her Mum, And Her Dad? by imonisweet(m): 6:45pm On Apr 08, 2019

ifada123:
Try this sir
Solve
(√2 +1)^x +(√2 -1)^x=34

Bros you sure say this your question legit so

Re: How Old Is She, Her Mum, And Her Dad? by Bizmagnet: 7:31pm On Apr 08, 2019

ifada123:
Try this sir
Solve
(√2 +1)^x +(√2 -1)^x=34

First find the log of both sides
Log(√2 +1)^x+ log (√2 -1)^x = log34
xlog(√2 +1) + xlog(√2 -1) = log34
x[log (√2 +1) + log(√2 -1)]= log34
xlog[(√2 +1)(√2 -1)]=log34
xlog(2-1) = log34
x = log34/log1
x=log34-log1
x=1.5315-0= 1.5315

Re: How Old Is She, Her Mum, And Her Dad? by kayalla(f): 12:09am On Apr 09, 2019

ah maths, my greatest fear then and till now.

Re: How Old Is She, Her Mum, And Her Dad? by ifada123: 6:36am On Apr 09, 2019

Bizmagnet:
First find the log of both sides
Log(√2 +1)^x+ log (√2 -1)^x = log34
xlog(√2 +1) + xlog(√2 -1) = log34
x[log (√2 +1) + log(√2 -1)]= log34
xlog[(√2 +1)(√2 -1)]=log34
xlog(2-1) = log34
x = log34/log1
x=log34-log1
x=1.5315-0= 1.5315

U try but ur assumption is not accurate
If a+b=c
Loga +logb is not equal to logc
Rather
Log(a+b)=logc,
Try again sir

If you don't mind send me ur Facebook name via Micah ifada
I will add u to message group were we play with maths.

Re: How Old Is She, Her Mum, And Her Dad? by ifada123: 6:40am On Apr 09, 2019

imonisweet:
Bros you sure say this your question legit so

Yes very correct,
If you don't mind send me ur Facebook name via Micah ifada
I will add u to message group were we play with maths.

Re: How Old Is She, Her Mum, And Her Dad? by naturalwaves: 5:55pm On Apr 11, 2019

princeking2:
Baba, I hail thee

Hahahaha!

Re: How Old Is She, Her Mum, And Her Dad? by naturalwaves: 5:57pm On Apr 11, 2019

fennels007:
oh, maths.
Whats is the secret?

Very simple. Understanding basic concepts and not just memorising.

Re: How Old Is She, Her Mum, And Her Dad? by naturalwaves: 5:57pm On Apr 11, 2019

olioxx:
.
.
You really know maths oo!
Made me remember "sets".
|Gbayi|

Lol. I dey try!

Re: How Old Is She, Her Mum, And Her Dad? by naturalwaves: 5:59pm On Apr 11, 2019

FromZeroToHero:
wonderful. thumbs up

Thanks man!

1 Like 1 Share

Re: How Old Is She, Her Mum, And Her Dad? by catalan15(m): 2:53pm On Apr 14, 2019

obashiakpu:
E go concern no be only agbero but the driver, conductor, police on d road plus including passengers and passersby. Maths is real for your good and good of others.

Funny.....

Re: How Old Is She, Her Mum, And Her Dad? by Obinoscopy(mod): 5:48am On Jun 18, 2020

ifada123:
Try this sir
Solve
(√2 +1)^x +(√2 -1)^x=34

(√2 +1)^x +(√2 -1)^x=34........eq 1

√2 +1 is actually equal to 1/(√2 -1). So one is the inverse of the other. We can use this relationship to solve further:

Let a = √2 +1.........eq 2

Therefore (√2 +1)^x becomes a^x and (√2 -1)^x becomes a^(-x). Thus eq 1 becomes:

a^x + a^(-x) = 34........eq 3

Let a^x = y.....eq 4

Therefore eq 3 becomes:

y + 1/y = 34......eq 5

Solving eq 5 further gives the quadratic equation:

y^2 - 34y + 1 = 0.....eq 6

y = 17 + 12√2.....eq 7 and
y = 17 - 12√2......eq 8

Recall that y = a^x and that a = √2 +1. Thus eq 7 and 8 becomes:

(√2 +1)^x = 17 + 12√2.....eq 9 and
(√2 +1)^x = 17 - 12√2.....eq 10

Solving eq 9:
(√2 +1)^x = 17 + 12√2
Find log of both sides:
Log (√2 +1)^x = Log (17 + 12√2)
x Log (√2 +1) = Log (17 + 12√2)
Thus x = Log (17 + 12√2)/Log (√2 + 1) = 4

Similarly, solving eq 10 gives:
x = Log (17 - 12√2)/Log (√2 + 1) = -4

In conclusion, the answer is ±4

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