Official Guide Explanation:
Problem Solving #35




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Solution and Metadata

Question: 35
Page: 157
Difficulty: 3 (Very Easy)
Category 1: Word Problems > Other >
Category 2: Arithmetic > Properties of Integers > Remainder

Explanation: If John loses seven socks, he'll retain the greatest number of matched pairs if those seven socks consisted of three matched pairs and one other sock. (Alternatively, if those seven socks were all from different matched pairs, he would have fewer matched pairs left.) Thus, John has remaining a maximum six matched pairs and one loner, choice (B).

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