Challenging Qn for Brain

[B1dada]

ANS ANS!!!... making me mad

[Hobbiez]

Thanks everyone for good try. So far 2-3 bros have managed to get correct answer of 7.83 minutes

[B1dada]

2min....

[Hobbiez]

Thanks Wolverman It is no excuse but getting tired that day. So anyhow typed.

[Ronnchee]

I also have something to share ...

 

You must use exactly $100 to buy 100 chickens, which consist of small chicks ($0.10/each), hens ($3.00/each) and roosters ($6.00/each).

 

So, with $100 in hand, how many small chicks, hens, and roosters (all add up to 100 checkens) can you buy.

 

BTW, this is pri 4 maths.

[Poortraveller]

can advice your answer? bigger pipe take longer time to fill up the tank??

[Aimnfire]

u did not read the question correctly

it stated small pipe takes 6 min MORE than big pipe to fill

thats mean small pipe will take 7.83min + 6 min to fill up

[Bluenuts]

Aiyo....weekend lei...

Enjoy, relax, chill...

I only wan two chicken wings to go with my drinks

Cheer!!

[Ronnchee]

I would rather have 2 chickens from Gexlang ... ha ha ha

[Baka]

Answer is 1 rooster, 29 hens and 70 chicks... took me 5 min to calculate... damn now primary 4 maths is so demanding already.

Edited September 22, 2007 by Baka

[Slowmo]

Yeah..... this must be a 6mark weight.

[Icekitten]

Thanks everyone for good try. So far 2-3 bros have managed to get correct answer of 7.83 minutes

 

So what level of math question is this?

 

The solution provided to arrive at 7.83 seems like an A.Maths formula. Which is only for upper Sec.

 

But the question itself seems, like what Mummypenguin has said, a primary school math question.

 

And you tutor Primary school maths right, from the past questions you've posted.

 

Can you enlighten us?

[Guyver]

Just a brain teaser Qn for you:

 

2 pipes takes 5 minutes to fill up a tank, and the smaller pipe alone takes 6 minutes more than the bigger pipe to fill the tank. How long would it takes for the bigger pipe to fill the tank alone?

 

I will provide the answer shortly.

 

Answer leh ....

[Hobbiez]

Volume of Tank = V

Big Pipe + Small Pipe = 5 minutes

Big Pipe = t

Small pipe = Time of Big pipe + 6 = t + 6

 

Each minute, Small pipe = V/(t+6)

Each minute, Big pipe = V/t

 

If multiply 5 minutes for each of them, it will be equal to V.

Then solve for t = 7.83

[Mivec9]

This is a typical trial and error question. I'd would it is quite tiring question

 

70 chicks $7bucks

29 Hens $87 bucks

1 rooster $6

[Ronnchee]

Nah, it's a logic question.

 

Where got so much time to do trial & error, the combination is too many. And hor, this is a pri 4 maths question.

[Vooth]

You are good, next time I get stumped by my son's homework I'm gonna post here and wait for your answers..

[Mivec9]

pity the kids nowadays...we dun have such "chimo-logy" then.

 

One word from them, the kids are separated into Em1-2-3, another word it becomes they need to take social studies compulsory...etc