gwd 4 31

Kath1985 · 发表于 2011-5-9 11:27:47

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

是A
不懂為什麼答案要把12放到分母如下: 請求指導
[attachimg=414,164]86715[/attachimg]

man85511 · 发表于 2011-5-9 13:14:59

=m*5280*12/(p*144/t)

gwd 4 31

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