原题1如下："In each production lot for a certain toy, 25 percent of the toys r red and 75% r blue. Half the toys r size A and half r size B. If 10 out of a lot of 100 toys are red and size A, how many of the toys r blue and size B?"
答案：35
why?作者: tongxun 时间: 2002-11-17 22:42
red blue total
sizeA 10 40 50
sizeB 15 35 50
total 25 75 100
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