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单选题
If r life boats can carry p passengers, how many life boats are needed to carry m passengers?
A
rm/p
B
pr/m
C
prm
D
pm/r
E
m/rp
参考答案
参考解析
解析：
Let n be the number of life boats needed to carry m passengers. You can compare life boats to passengers. r/p=n/m Cross multiply. Divide by p，n=rm/p.
Let n be the number of life boats needed to carry m passengers. You can compare life boats to passengers. r/p=n/m Cross multiply. Divide by p，n=rm/p.
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