SAT官方每日一题 Mathematics > Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

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

答案:C

Explanation

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.