AMC12 2019 A
AMC12 2019 A · Q2
AMC12 2019 A · Q2. It mainly tests Percent.
Suppose $a$ is 150% of $b$. What percent of $a$ is $3b$?
假设 $a$ 是 $b$ 的 150%。那么 $3b$ 是 $a$ 的百分之多少?
(A)
50
50
(B)
$66\frac{2}{3}$
66$\frac{2}{3}$
(C)
150
150
(D)
200
200
(E)
450
450
Answer
Correct choice: (D)
正确答案:(D)
Solution
Because $a = \frac{150}{100}b = \frac{3}{2}b$, it follows that $3b = 2a$, so $3b$ is 200% of $a$.
因为 $a = \frac{150}{100}b = \frac{3}{2}b$,因此 $3b = 2a$,所以 $3b$ 是 $a$ 的 200%。
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