单选题A swimming pool with a capacity of 20,000 gallons is one-quarter full. A pump can deliver g gallons of water every m minutes. If a company charges d dollars per minute for the use of the pump, then in terms of g, m, and d, how much will it cost, in dollars, to fill the pool?A15,000gd/mB15,000gmdC15,000md/gDgd/(15000m)Egm/(15000d)
单选题
A swimming pool with a capacity of 20,000 gallons is one-quarter full. A pump can deliver g gallons of water every m minutes. If a company charges d dollars per minute for the use of the pump, then in terms of g, m, and d, how much will it cost, in dollars, to fill the pool?
A
15,000gd/m
B
15,000gmd
C
15,000md/g
D
gd/(15000m)
E
gm/(15000d)
参考解析
解析：
如果当这个游泳池能装20,000加仑水，现在还有四分之三体积未装满，那么装满这个游泳池，还需要(3/4) ×20,000=15,000加仑水。抽水泵每分钟g加仑水需支付d美元，那么每加仑水m分钟需要钱为md/g，那么15000加仑水则为15,000md/g。
如果当这个游泳池能装20,000加仑水，现在还有四分之三体积未装满，那么装满这个游泳池，还需要(3/4) ×20,000=15,000加仑水。抽水泵每分钟g加仑水需支付d美元，那么每加仑水m分钟需要钱为md/g，那么15000加仑水则为15,000md/g。
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