Student Perfect strikes again

Level pending

If, in a class of 42 learners, Student Perfect has 100% on his maths test and the class average of the test is 60%, approximately how much (in percent) would the average drop if he hadn't written the test?


The answer is 1.

Thomas Hettasch by Thomas Hettasch , 21, South Africa

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1 solution

Sungil Cho
Apr 19, 2014

Let X be the sum of the scores of the other students. Now, 100 + X 42 = 60. \frac{100+X}{42}=60. Then, 60 − X 41 60-\frac{X}{41} approximately equals to 1.

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