题目

The maximum possible score in an exam is N while the pass mark is 35% of N. A student obtains 42 marks, but he falls short of the pass mark by 40%. What is the value of N ?

选项

A.

125

B.

150

C.

200

D.

300

E.

None of the above

解析

42 比 $N$ 的 35% 少 40%。 因此 $42 = (100\%-40\%) \times (35\% \times N) = 60\% \times 35\% \times N = 21\% \times N$ 由此可得,若 $42 = 21\% \times N$,则 $N$ 的 100% 为 $42\times100\div21 = 200$ 答案:C - 200
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