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Maths Tricks, Questions And Brain Teasers - Education - Nairaland

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Maths Tricks, Questions And Brain Teasers by sauer(m): 10:54pm On Jan 19, 2012
High time we had something for maths peeps, if you know what I mean. This thread will provide so-called maths tricks for those who want to impress their bfs/gfs, questions for those who want a bit of some maths challenge, and brain teasers for those who sit all day on their computers.
Please contribute and be creative, at least a little wink

And will this be the first of its kind on NL? undecided

sauer!
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:02pm On Jan 19, 2012
If you have three apples and you took away two, how many will you have?
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:04pm On Jan 19, 2012
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 Natasha2(f): 11:05pm On Jan 19, 2012
sauer:

If you have three apples and you took away two, how many will you have?
two
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:06pm On Jan 19, 2012
Natasha,,:

three
wrong!  tongue you[b] took away[/b] two, remember?
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:08pm On Jan 19, 2012
I was running in my head through my store of maths tricks and discovered:

3 can divide any number, which if you add its digits is divisible itself by 3
e.g 27/3 = 9, but then (2+7)/3 = 3!

393/3 = 131, and (3+9+3)/3 = 5!

Try yours! wink
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:11pm On Jan 19, 2012
in how many ways can you choose 5 moderators (3 for auto section and 2 for romance) on NL out of 20 applicants? Consider that 3 applicants are not qualified because they have been initially banned!
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:12pm On Jan 19, 2012
In how many ways can you spell NAIRA, if N has to start and A has to end all the time!?
Re: Maths Tricks, Questions And Brain Teasers by Natasha2(f): 11:12pm On Jan 19, 2012
sauer:

wrong!  tongue you[b] took away[/b] two, remember?
you were the one who took the two away remember so you still have them with you tongue
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:15pm On Jan 19, 2012
Natasha,,:

you were the one who took the two away remember so you still have them with you tongue
hmmm. . . .you never sharp reach! Yes, you have them with you. But cos you are "away", you aren't close to the remaining one.
So, you have only two, not three!
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:15pm On Jan 19, 2012
You are on an island in the middle of a lake. The lake is in a remote part of the country and there has never been a bridge connecting the island to the mainland.

Every day a tractor and wagon gives hay rides around the island. Puzzled as to how the tractor had gotten onto the island, you ask around and find out that the tractor was not transported to the island by boat or by air. Nor was it built on the island.

Explain how the tractor got there?
Re: Maths Tricks, Questions And Brain Teasers by Natasha2(f): 11:19pm On Jan 19, 2012
sauer:

hmmm. . . .you never sharp reach! Yes, you have them with you. But cos you are "away", you aren't close to the remaining one.
So, you have only two, not three!
you said ''you took them away'' now you said ''because you're away'' so did the apples go their own way?  grin you took them away, they went with you  tongue
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:22pm On Jan 19, 2012
Natasha,,:

two
damn! did you change that answer or is it my eyes? clever girl! grin
Re: Maths Tricks, Questions And Brain Teasers by Natasha2(f): 11:23pm On Jan 19, 2012
sauer:

damn! did you change that answer or is it my eyes? clever girl! grin
its your eyes grin
lemme try another one
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:25pm On Jan 19, 2012
Can you make four (4) nines (9) equal 100??
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:26pm On Jan 19, 2012
Natasha,,:

its your eyes grin
lemme try another one

lwkmd cheesy ----> on another note angry
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:27pm On Jan 19, 2012
in how many ways can you arrange the word "RISE"? Preference not given to any particular word!
Re: Maths Tricks, Questions And Brain Teasers by Natasha2(f): 11:27pm On Jan 19, 2012
sauer:

You are on an island in the middle of a lake. The lake is in a remote part of the country and there has never been a bridge connecting the island to the mainland.

Every day a tractor and wagon gives hay rides around the island. Puzzled as to how the tractor had gotten onto the island, you ask around and find out that the tractor was not transported to the island by boat or by air. Nor was it built on the island.

Explain how the tractor got there?
the tractor was not on the island
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:29pm On Jan 19, 2012
Natasha,,:

the tractor was not on the island
okay, if it's not on the island, it rides around in the water abi? mtschew, you berra pay attention! angry
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:31pm On Jan 19, 2012
Look at the picture and say the COLOR of the word, not the word itself.

Difficult, ehn?








plucked from: www.optillusions.com

Re: Maths Tricks, Questions And Brain Teasers by Natasha2(f): 11:32pm On Jan 19, 2012
sauer:

In how many ways can you spell NAIRA, if N has to start and A has to end all the time!?
one
Re: Maths Tricks, Questions And Brain Teasers by Natasha2(f): 11:34pm On Jan 19, 2012
sauer:

okay, if it's not on the island, it rides around in the water abi? mtschew, you berra pay attention! angry
lol lemme think
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:35pm On Jan 19, 2012
Natasha,,:

lol lemme think
one? when you have NAIRA, NARIA, NRIAA, . . . . . .come on, use permutation!

1 Like

Re: Maths Tricks, Questions And Brain Teasers by Natasha2(f): 11:36pm On Jan 19, 2012
sauer:

Look at the picture and say the COLOR of the word, not the word itself.

Difficult, ehn?








plucked from: www.optillusions.com
I did it, but hey it really got me at first  cheesy
Re: Maths Tricks, Questions And Brain Teasers by Natasha2(f): 11:37pm On Jan 19, 2012
sauer:

one? when you have NAIRA, NARIA, NRIAA, . . . . . .come on, use permutation!
Yes its just one, since you can't pronounce these words as Naira
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:45pm On Jan 19, 2012
Natasha,,:

Yes its just one, since you can't pronounce these words as Naira
hmmm. . . .well, the aim is not to make them pronounceable, just to have them!

Brute force: NAIRA =NAIRA, NIRAA, NARIA, NRIAA, NIARA, NRAIA

using permutation: place N and A at beginning and end of word respectively. There are two A's. Since they are indistinguishable, it changes nothing. Assuming no repetition then, the letters in the middle (3 of them) can be arranged in 3 x 2 x 1 ways. So we have 6 ways!

If repetition were allowed, in which case the two A's are distinguishable (?), then just multiply answer by 2. So, we have 12 ways. Not a sane answer, though! wink
Re: Maths Tricks, Questions And Brain Teasers by Natasha2(f): 11:45pm On Jan 19, 2012
sauer:

Can you make four (4) nines (9) equal 100??
how did I skip this?  grin
99 + 9/9 =100
9/9=1 so 9 +1 =100  

1 Like

Re: Maths Tricks, Questions And Brain Teasers by eghost247(m): 11:46pm On Jan 19, 2012
sauer:

If you have three apples and you took away two, how many will you have?
you stil have all your apples Joor
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:46pm On Jan 19, 2012
Q: What 7 letter word becomes longer when the third letter is removed?

A: Lounger

**edited with answer**
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:47pm On Jan 19, 2012
Natasha,,:

how did I skip this?  grin
99 + 9/9 =100
9/9=1 so 9 +1 =100  


hurray!!!! cheesy. She is clever after all
Re: Maths Tricks, Questions And Brain Teasers by sauer(m): 11:47pm On Jan 19, 2012
eghost247:

you stil have all your apples Joor
undecided
Re: Maths Tricks, Questions And Brain Teasers by Natasha2(f): 11:48pm On Jan 19, 2012
sauer:

hmmm. . . .well, the aim is not to make them pronounceable, just to have them!

Brute force: NAIRA =NAIRA, NIRAA, NARIA, NRIAA, NIARA, NRAIA

using permutation: place N and A at beginning and end of word respectively. There are two A's. Since they are indistinguishable, it changes nothing. Assuming no repetition then, the letters in the middle (3 of them) can be arranged in 3 x 2 x 1 ways. So we have 6 ways!

If repetition were allowed, in which case the two A's are distinguishable (?), then just multiply answer by 2. So, we have 12 ways. Not a sane answer, though!  wink
all right

eghost247:

you stil have all your apples joor
lol its like you haven't eaten apples for a long time  grin grin

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