alleryRia drank 1/3 of a bottle, then another 1/4 of it. Total drunk?
A2/7
B1/7
C7/12
D2/12
Answer & Solution
Correct answer: C. 7/12
1. Thirds and quarters are unlike, so convert both to twelfths.
2. 1/3 = 4/12 and 1/4 = 3/12, so the sum is 7/12.
3. 2/7 and 1/7 add tops and bottoms, which is wrong, and 2/12 adds only the tops of mismatched parts.
_Source: Wikipedia, Fraction, section Adding unlike quantities_
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