AMC8 1994

AMC8 1994 · Q14

AMC8 1994 · Q14. It mainly tests Averages (mean), Rates (speed).

Two children at a time can play pairball. For 90 minutes, with only two children playing at one time, five children take turns so that each one plays the same amount of time. The number of minutes each child plays is

每次两个孩子玩配对球。90分钟内，每次只有两个孩子玩，五个孩子轮流玩，每人玩的时间相同。每个孩子玩的分钟数是

(A) 9 9

(B) 10 10

(D) 20 20

(E) 36 36

Answer

Correct choice: (E)

正确答案：（E）

Solution

Total playing time 2×90=180 minutes. Divided by 5 children: 180/5=36 minutes each.

总玩耍时间2×90=180分钟。5个孩子平分：180/5=36分钟每个。

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