GMAT Practice Question Source:
GMAT Study Guide Module:
GMAT Timing Tips:
- Weighted average mapping strategy: Use the weighted average mapping strategy to find the ratio of apples to oranges both before and after putting back the oranges. This is a shortcut for the algebra, and can be a great way to save valuable time on the GMAT. You’ll find that the ratio is 4 to 1 before (so 10 total fruits gives us 8 oranges and 2 apples) and 3 to 2 after putting back the apples.
- Track how the parts of a whole change: The key thing to notice is that there are the same number of apples (2) before and after putting back the oranges. So, if the ratio is 3 oranges to 2 apples after putting back the oranges, then we end up with 2 apples and 3 oranges. This means that Mary put back 8 – 3 = 5 oranges.
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