AMC 8 1987 Problem 16

AMC8 1987 年第 16 题

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Problem Joyce made 12 of her first 30 shots in the first three games of this basketball season, so her seasonal shooting average was 40%. In her next game, she took 10 shots and raised her seasonal shooting average to 50%. How many of these 10 shots did she make?

在本篮球赛季的前三场比赛中前 30 次出手命中 12 次，因此她的赛季命中率为 40%。在下一场比赛中，她出手 10 次并将赛季命中率提高到 50%。这 10 次出手她命中了多少次？

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