AMC12 2020 A

AMC12 2020 A · Q1

AMC12 2020 A · Q1. It mainly tests Fractions, Arithmetic misc.

Carlos took 70% of a whole pie. Maria took one third of the remainder. What portion of the original pie was left?

Carlos 拿走了整个饼的 70%。Maria 拿走了剩余部分的 1/3。原饼还剩下多少？

(A) 10% 10%

(B) 15% 15%

(D) 30% 30%

(E) 35% 35%

Answer

Correct choice: (C)

正确答案：（C）

Solution

After Carlos took 70% of the pie, 30% remained. Maria took a third of that, which was 10% of the whole pie. Therefore 30% − 10% = 20% of the original pie was left.

Carlos 拿走饼的 70% 后，剩下 30%。Maria 拿走其中的三分之一，即整个饼的 10%。因此 30% − 10% = 20% 的原饼还剩下。

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