Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

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Topic review (newest first)

Jenilia
2005-08-29 18:06:46

Of cause I am back

MathsIsFun
2005-08-25 18:07:04

Depends on the questions ...

Glad you are back again, Jenilia!

Jenilia
2005-08-25 18:01:18

You call that good? I only got 16/30 you know, for the standard.

wcy
2005-08-13 21:00:25

yeah 2nd is school is really good

MathsIsFun
2005-08-13 17:00:12

I was impressed by how well you did in your in school competition. Jenilia.

Please visit more, try some of the puzzles ganesh sets, and ask any quesitons you want.

Jenilia
2005-08-13 15:28:15

Thanks for teaching me Ganesh.

ganesh
2005-07-30 16:22:15

Nora can paint 1/6 of a house in 1 day.
Therfore, she takes 6 days to paint the house.
Meera can paint the whole house 2 days faster.
So, she can paint the house in 4 days.
In one day, Meera can paint 1/4 of the house.
If both of them paint the house together, in one day,
they can paint (1/6+1/4) of th house. That is,
10/24 or 5/12. Therefore, the whole house can be painted
by them in 12/5 days, that is 2 2/5 days. smile

Jenilia
2005-07-30 11:18:37

I got a question to ask? Nora can paint 1/6 of a house in 1 day. Meera can paint the whole house 2 days faster. If both of them paint the house together, how long will they take.
  The answer is 2 3/4 days. I figured out the answer in school which is correct. But when I came home I forgot the answer. Now I am dieing to know the answer.

Jenilia
2005-07-30 11:11:02

Hey, maybe you can try next time. Anyway I just participated in the best in school competition. Out of 360 students I came in the second.

anyarules
2005-07-26 20:50:32

[be nice] Anyone from Australia?? we just recently did a olympiad test and i got 3/5. how saad. it's about this ant walking around this cube.

MathsIsFun
2005-07-26 18:10:04

I guess it doesn't matter how big the deck of cards is, so long as we know they are unique numbers.

So, it is really as easy as thinking "I choose the numbers 1 to 4 in random order, what are the chances of them being perfectly 4321?"

Do you want to try to figure THAT one out? (Hint: how many combinations are possible, and how many match what you are after?)

Jenilia
2005-07-26 18:05:33

Maths is fun, can you explain the answer for the seniors question.

MathsIsFun
2005-07-21 07:34:38

Well, perhaps we could take one of those questions, and try reasoning it out, so that Jenilia and everyone else can learn techniques.

For example, samples from  your first link:

Junior:
"The sum of seven, single-digit positive whole numbers is 17. Six of these numbers are equal, so what is the other number?"

Intermediate:
"Alice's room is furnished with three-legged stools and four-legged chairs. There are 17 legs in all (excluding Alice's!). How many three-legged stools are there?"

Senior:
"The cards in a set of 36 are numbered 1 to 36. The cards are shuffled and four cards are dealt. What are the chances of them being dealt in descending order?"

mathsyperson
2005-07-21 00:01:30

I posted some links on that earlier.

mathsyperson wrote:

If you want to try some of the questions, there are some samples here or try the most recent junior, intermediate or senior past papers.

MathsIsFun
2005-07-20 22:31:34

Maybe we could find some sample questions

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