AMC8 1998

AMC8 1998 · Q8

AMC8 1998 · Q8. It mainly tests Rates (speed).

A child's wading pool contains 200 gallons of water. If water evaporates at the rate of 0.5 gallons per day and no other water is added or removed, how many gallons of water will be in the pool after 30 days?

一个儿童戏水池中有 200 加仑水。如果水每天蒸发 0.5 加仑，且没有其他水加入或移除，30 天后池中水有多少加仑？

(A) 140 140

(B) 170 170

(D) 198.5 198.5

(E) 199.85 199.85

Answer

Correct choice: (C)

正确答案：（C）

Solution

$200 - 0.5(30) = 200 - 15 = 185$ gallons.

$200 - 0.5(30) = 200 - 15 = 185$ 加仑。

Topics

AR.007 Rates (speed)