Question

Mika 想估计她的电动自行车充满电能骑多远。两次骑行一共骑了 $40$ 英里。第一次用了 $\frac{1}{2}$ 的电量，第二次用了 $\frac{3}{10}$ 的电量。充满电大约可以骑多少英里？

Mika would like to estimate how far she can ride a new model of electric bike on a fully charged battery. She completed two trips totaling $40$ miles. The first trip used $\frac{1}{2}$ of the total battery power, while the second trip used $\frac{3}{10}$ of the total battery power. How many miles can this electric bike go on a fully charged battery?

$45$

$48$

$50$

$52$

$55$

答案：C

知识点：分数比与比例

难度评级：980

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文字解答：

两次骑行一共用了 $\frac12+\frac3{10}=\frac45$ 的满电电量。因为 $\frac45$ 的续航是 $40$ 英里，所以充满电可以骑 $40\div\frac45=50$ 英里。

The two trips used $\frac12+\frac3{10}=\frac45$ of a full battery. Since $\frac45$ of the range is $40$ miles, a full charge gives $40\div\frac45=50$ miles.

2026 AMC 8 第 7 题

答案：C

难度评级：980

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文字解答：

其他年份的第 7 题