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Of 60 pairs of socks in a drawer, 40% are blue, and the remaining pairs of socks are all gray. If 4 pairs of blue socks are removed from the drawer, what is the ratio of gray pairs of socks to blue pairs of socks?

Explanation

Before 4 pairs of socks were removed, the drawer contained 24 pairs of blue socks \((60 \times 40 \%=24)\) and 36 pairs of gray socks. (24+36 = 60). After removing 4 pairs of blue socks, the drawer contains 20 pairs of blue socks and 36 gray socks. Therefore, the ratio of gray pairs to blue pairs is 36 to 20, or 9 to 5.

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