Question Help : GMAT Quantitative Section

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Senior Manager

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Question Help [#permalink]

30 Jan 2007, 07:34

This question is from the official guide and I'm certain that I'm overlooking something simple (but crucial). The explanation given was horrendous so can someone help me understand the answer? Thanks.

Q: Equal amounts of water are poured into two empty jars of different capacity which made one 1/4 full and the other 1/3 full. Water in the lesser capacity jar is poured into the jar with greater capacity. How full of water is the larger jar now?

A: 1/2

I can't get how it will be 1/2 and not 7/12

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30 Jan 2007, 07:42

Assume the first jar has a capacity of 12 and the second 9. If you fill 3 litres of water in both, the first is 1/4 and the next is 1/3 filled. If you add the same to the first, it will have 6 litres which is 1/2 its capacity.

I would say, do not calculate. Just think of adding twice the quantity to the first. 1/4 + 1/4 =1/2

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30 Jan 2007, 08:50

Q: Equal amounts of water are poured into two empty jars of different capacity which made one 1/4 full and the other 1/3 full. Water in the lesser capacity jar is poured into the jar with greater capacity. How full of water is the larger jar now?

Jar Capacity is different and the amount of water poured is equal.

Pick numbers For the larger jar to be a multiple of 4 and smaller jar to be a multiple of 3

Larger Jar Capacity = 8 lit
Smaller Jar Capacity = 6 Lit
Equal amount of water being poured in the 2 jars (Say 2 lit)

Larger Jar is 2/8 full = 1/4
Smaller Jar = 2/6 full = 1/3

Now pour the 2 lit from smaller jar into the larger jar.
Larger jar jas gone to 4 lit (2 + 2).

Therefore Larger jar is now 4/8 full = 1/2

Senior Manager

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30 Jan 2007, 09:51

Thanks so much guys, I got it now. I think I was just way overthinking and making it harder than it needed to be!

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Re: Question Help [#permalink]

31 Jan 2007, 02:45

skaballet wrote:

)))good problem
I guess we just complicating the simple problem
the key words are
Equal amounts of water and one 1/4 full
Water from lesser jar is poured into the jar with greater capacity
so if Equal amounts of water is poured into one 1/4 full
it is clear that the jar becomes 1/2 full
_________________

IE IMBA 2010

Re: Question Help [#permalink] 31 Jan 2007, 02:45

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