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标题: [求助]GWD-1-33 [打印本页]

作者: xiaoyue 时间: 2005-9-5 06:27 标题: [求助]GWD-1-33

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

请问这题怎么做?谢谢!!

作者: himba 时间: 2005-9-5 13:16

已知N2/N4=8/5；N1/N2=3/4；N3/N4=3/2, 求：N1/N3

根据N2/N4=8/5；N3/N4=3/2,可得：N2/N3=16/15

再根据N1/N2=3/4；N2/N3=16/15，可得结果：N1/N3=4/5

作者: xiaoyue 时间: 2005-9-6 06:00

明白了。谢谢版主！！！

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