prep 1

[Chaitanya_1986]

Please help

[Anurag@Gurome]

Please help

The jar that 1/4 full is the larger of the two jars (let us call this Jar A), while the jar that is 1/3 full is the smaller jar (let us call this as Jar B).
Now we pour water from Jar B to Jar A. This means that Jar A will be filled to 2 * (1/4) = 1/2 of its capacity (remember that amount of water is the same in both the jars).

The correct answer is C.

[kannans3]

The bigger jar is the one which gets filled the least.

So, the jar filled to 1/4th is bigger than the jar filled to 1/3rd. Pour the liquid from the jar filled to 1/3rd into 1/4th which will bring it to 1/2 its capacity.

Answer is C.

[edvhou812]

The way I looked at this one is "A four gallon jar contains one gallon of water, and a three gallon jar holds one gallon of water. What faction of the four gallon jar is filled if I fill it with the contents of the three gallon jar?"

Four gallon jar is currently 1/4 full
Three gallon jar is currently 1/3 full

Add one gallon to the four gallon jar, and it becomes 2/4 full, which reduces to 1/2.

IMO: This is less mathematical and possibly "lame" way to approach the problem, but it got the job done with this question. Not so sure about more complicated problems though.

[GMATGuruNY]

Equal amounts of water were poured into two empty jars of different capacities, which made one jar 1/4 full and the other jar 1/3 full. If the water in the jar with the lesser capacity is then poured into the jar with greater capacity, what fraction of the larger jar will be filled with water?

a)1/7
b)2/7
c)1/2
d)7/12
e)2/3

If pouring X liters into the larger jar makes it 1/4 full, then doubling the X liters (by adding the water from the smaller jar) will make the larger jar 2*(1/4) = 1/2 full.

The correct answer is C.

[artistocrat]

It doesn't matter how full the smaller jar is (1/3). All that matters is that it is the same amount of water as in the big jar ie. 1/4. So if you add another 1/4 to 1/4, you get 1/2.