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The ratio of r to s is 3 to 4. The ratio of s to t is 2 to 9. What is the ratio of r to t?

单选题
2022-09-22 14:18
A、1 to 3
B、1 to 6
C、2 to 9
D、3to10
E、4 to 5
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正确答案
B

试题解析

根据题干r/s=3/4,s/t= 2/9,所以s=(2t)/9。因为r/s=3/4,r/s=r/{(2t)/9}=3/4,(9r)/(2t)=3/4,所以r/t=(3/4)(2/9)=1/6,故选B。

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