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求助GWD1-33

Q33:

At a certain school, the ratio of the number of second graders to the number of fourth graders is 8 to 5, and the ratio of the number of first graders to the number of second graders is 3 to 4. If the ratio of the number of third graders to the number of fourth graders is 3 to 2, what is the ratio of the number of first graders to the number of third graders?

A. 16 to 15

B. 9 to 5

C. 5 to 16

D. 5 to 4

E. 4 to 5

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二:四 = 8:5 ------(1)

一:二 = 3:4 ------(2)

三:四 = 3:2 ------(3)

问:一:三 = ?

很容易啊!!

(1)/(3)= 16/15 = 二:三 ------(4)

(2)*(4)= 48/60 = 4/5 = 一:三......即为答案~~~选E

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