GMAT Practice Question Source:
GMAT Study Guide Module:
GMAT Timing Tips:
- Pick smart numbers to plug into variables in answer choices: Notice that the algebra looks pretty ugly on this question, so you may want to pick smart numbers to save time and reduce your chances of making an error. While you are ultimately picking a value for p, notice that you are really picking values for A and B that will lead to a nice value for p. Since B is multiplied by 5/4, 4 is a good, easy choice for B. Choices for A that lead to nice values of p are A=1 (p=20) and A=4 (p=50); p=20 is easier to plug into the answer choices, so let’s go with A=1. This means that r=100/6, so we plug in for p and see which answer choice gives us 100/6 for r.
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