There are a total of 21 apples and avocados at a basket. If the ratio of the number of avocados to the number of apples at the b

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问题 There are a total of 21 apples and avocados at a basket. If the ratio of the number of avocados to the number of apples at the basket is 5 to 2, how many apples are at a basket?

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答案6

解析比例表达为“the ratio of(the number of avocados)to(the number of apples)at the basket is 5 to 2”。则设the number of avocados(牛油果的个数)为A，设the number of apples(苹果的个数)为B。那么该句表示A: B=5：2，即2A=5B。又因为avocado和apple的总数是21，则A+B=21。解这个二元一次方程组，得到：A=15，B=6。则apple的个数是6。

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本试题收录于： GRE QUANTITATIVE题库GRE分类