CAT 2018 Slot 1 QA Question 21

Type-in-the-answer (no negative marking) · Arithmetic · Mean, Median & Mode · Try it, then check the answer and solution below.

CAT 2018 Slot 1QAArithmetic • Mean, Median & ModeModerate

A CAT aspirant appears for a certain number of tests. His average score increases by 1if the first 10tests are not considered, and decreases by 1if the last 10tests are not considered. If his average scores for the first 10and the last 10tests are 20and 30, respectively, then the total number of tests taken by him is

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Official Convenor Answer Key: 60

Verified Solution: Let

N

be the total number of tests and

A

be the average score of all

N

tests. The total score for all

N

tests

Answer and solution

Answer: 60

Let

N

be the total number of tests and

A

be the average score of all

N

tests. The total score for all

N

tests

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