CAT 2018 Question Paper Shift 1 Solved Paper

Question : 98 of 100

Marks: +1, -0

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

Your Answer:

Validate

Solution:

Let the average score of the aspirant in all the tests be

x

.
Let the number of tests be

n

.
The aspirant's average score for the first 10 tests and last 10 tests are 20 and 30 respectively.

\;{n x-200}/{n-10}=x+1

and

\;{n x-300}/{n-10}=x-1

Solving, we get

{n}=60

Go to Question:

Prev Question

Next Question