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单选题
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?
A
1 to 3
B
1 to 6
C
2 to 9
D
3to10
E
4 to 5
参考答案
参考解析
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。
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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