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Maths Tricks, Questions And Brain Teasers - Education (15) - Nairaland

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Re: Maths Tricks, Questions And Brain Teasers by Nobody: 9:21am On Jul 27, 2012
sauer: Seven years ago, Julia's mum was twice as old as Julia. Today Julia's mum is 31. How old is Julia?

M-7=2(D-7)
M-7=2D-14
M-2D=-7 *
M=31
Sub 31 for M in eqn *
31-2D=-7
-2D=-38
D=19
Hence Julia is 19 year old.
Re: Maths Tricks, Questions And Brain Teasers by Nobody: 9:41am On Jul 27, 2012
sauer: The difference between two numbers is -38. Two times the smaller number minus five times the larger number is -217. What are the numbers?

Let the smaller number be x and the bigger one γ̲̣̣̥
X-y=-38....eqn (1)
2x-5y=-217...eqn (2)
4rm eqn(1)
X=y-38*
Sub y-38 for x in eqn(2)
2(y-38)-5y=-217
2y-76-5y=-217
-3y=-141
Y=47
4rm eqn(*)
X=y-38
Sub 47 for y in eqn(*)
X=47-38
X=9
So the smaller and the larger numbers are 9 and 47 Respectively.
Re: Maths Tricks, Questions And Brain Teasers by Nobody: 10:15am On Jul 27, 2012
kariolality: You have got to fill a cylindrical drum with a bucket(frustrum of a cone) by fetching water from the tap with the bucket and pouring it into the drum(cylinder), The bucket is 20cm deep,with the top and buttom radius of 21cm and 7cm, approximate the number of time you will fetch from the tap to fill the cylindrical drum if the height of the drum 120cm and its radius is 42cm , if u get the answer,i got a small gift for you, cool sad
Volume of a bucket 22/7*H/3(R^3-r^3)/R-r
Volume of cylinder pai*r^2*h
Solution
Volume of cylinder ÷ Volume of bucket
Ans:50 times because you need 50 of the Buckets τ̅☺ make the cylinder Full.
Re: Maths Tricks, Questions And Brain Teasers by Nobody: 10:48am On Jul 27, 2012
A Football match is τ̅☺ be played involving τ̅☺ teams A and B
What is the probability the match Ends in a draw....?
Re: Maths Tricks, Questions And Brain Teasers by Nobody: 9:16am On Jul 28, 2012
B can win, A can win, or the match could be a draw. Three possibilities
Hence, P = 1/3
Re: Maths Tricks, Questions And Brain Teasers by Nobody: 1:15pm On Aug 08, 2012
sauer: A guy can upload 1MB on the internet for 20mins. Another can upload the same 1MB for 15mins. What are the chances they can both upload a divisible 1MB file for 10mins, if they work together? undecided
Re: Maths Tricks, Questions And Brain Teasers by Wemmy6284(m): 8:56pm On Aug 10, 2012
Graph of y=2x^2+8x+6 ..x will be what?..when the slope is 12.....
Re: Maths Tricks, Questions And Brain Teasers by Nobody: 9:30pm On Aug 10, 2012
Wemmy6284: Graph of y=2x^2+8x+6 ..x will be what?..when the slope is 12.....
Such graph cant have a slope. It's a quadratic graph.
Re: Maths Tricks, Questions And Brain Teasers by Nobody: 9:35pm On Aug 10, 2012
sauer: [/quote][quote author=sauer][/quote[quote author=Wemmy6284]Graph of y=2x^2+8x+6 ..x will be what?..when the slope is 12.....
]
Wemmy6284: Graph of y=2x^2+8x+6 ..x will be what?..when the slope is 12.....

Differentiate
4x+8=12
4x=12-8
X=1
Re: Maths Tricks, Questions And Brain Teasers by Nobody: 9:40pm On Aug 10, 2012
sauer: B can win, A can win, or the match could be a draw. Three possibilities
Hence, P = 1/3
9ice one Bro......
Re: Maths Tricks, Questions And Brain Teasers by Nobody: 9:42pm On Aug 10, 2012
Lack of mathematcal aptitude. Smh!
You only say dy/dx = slope, when u are talking about a linear curve. When it's nonlinear, then it's "rate of change".
What will be the value of x, when the rate of change of y wrt x is 12? Gerrit?
Re: Maths Tricks, Questions And Brain Teasers by Nobody: 9:46pm On Aug 10, 2012
Or at best, when the slope of the tangent at x is 12?
Re: Maths Tricks, Questions And Brain Teasers by Nobody: 11:01pm On Aug 10, 2012
Ok Sir
Re: Maths Tricks, Questions And Brain Teasers by Wemmy6284(m): 7:44am On Aug 11, 2012
sauer:
Such graph cant have a slope. It's a quadratic graph.
It is not a linear graph,i know it doesn't have a constant slope...but all the same,thnks 4 d correction..Yeah
Re: Maths Tricks, Questions And Brain Teasers by Wemmy6284(m): 7:47am On Aug 11, 2012
sauer: Or at best, when the slope of the tangent at x is 12?
yeah,.oh,this is how i suppose to put d question....mistake won't repeat itself.
Re: Maths Tricks, Questions And Brain Teasers by Harrypoter(m): 1:38am On Sep 04, 2012
sauer:
WRONG!!


How did you come about "2"? well, nice. Correct, smart a/ss!
Susie was with no calc though. "Times zero, plus two, divided by one" is all you need in that long essay-like mathematical question!


Dtx not it...She multiplyed everything by ZERO & ADDED 2/1 = 2.....
And diaz nufn lyk d use of calculator in there!!!!
Re: Maths Tricks, Questions And Brain Teasers by Stpirate(m): 3:21pm On Sep 04, 2012
Make I See Who Sabi Solve Maths here
10 + 0 * 10 + (10 * 0 + 10) - 5=
Mathematicians Do Your Thing Lol.
Re: Maths Tricks, Questions And Brain Teasers by dj5naira(m): 4:03pm On Sep 04, 2012
Stpirate:
10 + 0 * 10 + (10 * 0 + 10) - 5=
5.
Re: Maths Tricks, Questions And Brain Teasers by kariolality: 8:24pm On Sep 04, 2012
Stpirate:
10 + 0 * 10 + (10 * 0 + 10) - 5=.
15
Re: Maths Tricks, Questions And Brain Teasers by LordReed(m): 2:56am On Sep 05, 2012
dj5naira: 5.

Clear the sleep from your eyes....answer is 15
Re: Maths Tricks, Questions And Brain Teasers by dj5naira(m): 7:03am On Sep 05, 2012
Lord_Reed:

Clear the sleep from your eyes....answer is 15
Hand me a cutlass.
Re: Maths Tricks, Questions And Brain Teasers by LordReed(m): 8:42am On Sep 05, 2012
dj5naira: Hand me a cutlass.

Here

Re: Maths Tricks, Questions And Brain Teasers by dj5naira(m): 11:29am On Sep 05, 2012
Re: Maths Tricks, Questions And Brain Teasers by Nobody: 10:23pm On Sep 05, 2012
Lord_Reed:

Here
dj5naira: Hand me a cutlass.
And that's a cutlass!!
Re: Maths Tricks, Questions And Brain Teasers by oladayo042: 8:54am On Sep 06, 2012
If five people can kill five rats in five minutes, how many rats will fifty-five people kill in fifty-five minutes?
Re: Maths Tricks, Questions And Brain Teasers by dj5naira(m): 9:42am On Sep 06, 2012
sauer:
And that's a cutlass!!
Yes, it isn't.
Re: Maths Tricks, Questions And Brain Teasers by LordReed(m): 9:55am On Sep 06, 2012
sauer:
And that's a cutlass!!

Yeah, you could call it a weaponised cutlass such as the pirates and soldiers of yore used to carry. It is obviously not the everyday farm cutlass you seem to have in mind.
Re: Maths Tricks, Questions And Brain Teasers by purplekayc(m): 10:37am On Sep 06, 2012
kariolality: 15



Bodmas baby!!
grin
Re: Maths Tricks, Questions And Brain Teasers by kariolality: 6:47pm On Sep 06, 2012
purplekayc:



Bodmas baby!!
grin
Simple maths nao.
Re: Maths Tricks, Questions And Brain Teasers by LordReed(m): 7:29pm On Sep 06, 2012
oladayo042: If five people can kill five rats in five minutes, how many rats will fifty-five people kill in fifty-five minutes?

605

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