In a certain lawn-mower factory, 0.06 percent of all mowers produced are defective. On the average, there will be 3 defective mowers out of how many produced?
(A) 500
(B) 1800
(C) 5000
(D) 18000
(E) 50000
解释：
You need to observe that 0.06 percent means 0.06 out of every 100, and that this is the same ratio as 6 out of every 10000. Then get a ratio equivalent to 3 out of how many.
Recall that 0.06 percent means 0.06 out of every 100, or 6 out of every 10000. The question asks for an equivalent ratio: 3 out of how many. The ratio 6 out of 10000 can be reduced (by dividing both members by 2) to 3 out of 5000.
正确答案是C。
If a minus b = b minus 3 = 6, what is the value of a?
(A) negative 3
(B) 6
(C) 9
(D) 15
(E) 18
正确答案是D。
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