Bunuel
Jar X is 1/6 full of water. Jar Y, which has half the capacity of Jar X, is 1/2 full of water. If the contents of Jar X is poured into Jar Y, Jar Y will be filled to what fraction of its capacity?
A. 5/12
B. 2/3
C. 7/9
D. 5/6
E. 7/8
Kudos for a correct solution. VERITAS PREP OFFICIAL SOLUTION:Correct Answer: D
Plug in values for Jar X and Jar Y. To find a good number, multiply together the denominators of the two fractions in the problem; this will ensure that our calculations work nicely. If Jar X is 12 gallons, Jar Y would be 6 gallons. If Jar X is 1/6 full, it would contain 2 gallons of water. If Jar Y is 1/2 full, it would contain 3 gallons of water. Thus, when Jar X is poured into Jar Y, Jar Y would then have 5 gallons in it, which is 5/6 of its capacity, and the correct answer is (D).
To solve this problem algebraically, note that Jar X is 1/6 full, and Jar Y is 1/2 full. Because Jar Y is half as large as Jar X, Jar X is twice as large as Jar Y, so X = 2Y. 1/6 X must then equal 1/3 Y. Pouring Jar X into Jar Y means adding 1/3 Y (Jar X) to 1/2 Y (Jar Y), for a total of 5/6 Y.