GMAT
题目
The present ages of three persons are in the proportion of 5:8:7. Eight years ago, the sum of their ages was 76. Find the present age of the youngest person.
解析
设他们现在的年龄分别为\( 5x \)、\( 8x \)和\( 7x \)。
8年前他们的年龄总和为\( 20x - 24 = 76 \)
\( 20x = 100 \)
\( x = 5 \)
最年轻的人的年龄\( = 5x = 25 \)
答案是C
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