Question

一支球队在前 $50$ 场比赛中赢了 $40$ 场。为了使整个赛季的胜率正好为 $70\%$ ，这支球队在剩下的 $40$ 场比赛中必须赢多少场？

A team won $40$ of its first $50$ games. How many of the remaining $40$ games must this team win so it will have won exactly $70\%$ of its games for the season?

$20$

$23$

$28$

$30$

$35$

答案：B

知识点：百分数

难度评级：930

解答：

整个赛季共有 $50 + 40 = 90$ 场比赛， $90$ 的 $70\%$ 是 $63$ 场胜利。

球队已经赢了 $40$ 场，所以还需要赢 $63 - 40 = 23$ 场。

所以正确答案是 B。

The season has $50 + 40 = 90$ games, and $70\%$ of $90$ is $63$ wins.

The team already has $40$ wins, so it needs $63 - 40 = 23$ more.

Thus, the correct answer is B .

1995 AMC 8 第 14 题

答案：B

难度评级：930

解答：

其他年份的第 14 题