Among a batch of cars, a 74% of them have A, and a 71% of them have B. What is the percent of the cars that have both?
1)the percent of the cars that have B but not A is 11%
2)the percent of the cars that have both is twice the percent that have neither A nor B
Ans
请教思路作者: windyyang 时间: 2003-2-18 18:14
【思路】1) 71% -11%=60%
2) x=2[100-(74+71-x)], 得x=90. the percent of the cars that have both is 90%
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