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标题: 求教GWD4-31 [打印本页]

作者: huangsiyan 时间: 2011-2-24 07:00 标题: 求教GWD4-31

A solid yellow stripe is to be painted in the middle of a certain highway.If 1 gallon of paint covers an area of p square feet of highway, how many gallons of paint will be needed to paint a stripe t inches wide on a stretch of highway m miles long?(1 mile = 5,280 feet and 1 foot = 12 inches)

A.(5,280 mt) / 12p
B.(5,280 pt) / 12m
C.(5,280 pmt) / 12
D.(5,280)(12m) / pt
E.(5,280)(12p) / mt

答案是A, 可是我算出来的是5280mtp/12=440mtp。为什么答案是这样的呢？

作者: crystalbain 时间: 2011-2-25 06:43

p是在分母上，不是分子上...

(t/12)(5,280*m)/p

作者: huangsiyan 时间: 2011-2-25 21:03

额。。。我懂了，前面一直读错了题。谢谢啊

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