Big Book - Test 1 - Section 7 - Question #9

GRE Quant Problem Solving
1

Can someone explain why the answer is B?

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2

@kristina.muscat

Answer mentioned in the Big Book for Test 1 - Section 7 - Question #9 is A

3

okay, that is what I thought, but the answer is B in the answer key and was confused! Thank you!