Official Guide Explanation:
Problem Solving #131

Background

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Solution and Metadata

Question: 131
Page: 170
Difficulty: 5 (Moderate)
Category 1: Arithmetic > Ratio and Proportion >
Category 2: Arithmetic > Percents > other
Category 3: Word Problems > Rate Problems > other

Explanation: 15% of the 500 workers is equivalent to 75 workers, so there are 75 women among the current staff. If 50 more workers are hired, the total number of workers will be 550. If the number of women is raised to 20%, that would be equivalent to 20%(550) = 110. The difference between the target number of women (110) and the current number (75) is 110 - 75 = 35, choice (E).

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