AMC 8 1996 Problem 9

AMC8 1996 年第 9 题

比与比例★★☆☆☆

If 5 times a number is 2, then 100 times the reciprocal of the number is

如果 5 乘某个数等于 2，则 100 乘该数的倒数等于

正确答案 · Correct Answer

解析 · Solution

Solution 1

If 5 times a number is 2, then

\displaystyle 5x = 2 \rightarrow x = \frac{2}{5}

, and the number is

\displaystyle \frac{2}{5}

If the number is

\displaystyle \frac{2}{5}

, then 100 times its reciprocal is 100 times

\displaystyle \frac{5}{2}

, which is 250, giving an answer of

D

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