SSC CGL 10 Jun 2019 Shift 1 Paper

Question : 7 of 100

Marks: +1, -0

The average of 9 numbers is 40. If the average of the first five numbers is 38 and that of the last five is 50, then what is the fifth number?

Solution:

Total sum of all 9 numbers

=40 \×9=360

New,
Sum of first five numbers

=38 \×5=190

and
Sum of last five numbers

=50 \×5=250

\∴

Fifth number

=(250+190)-360

=440-360=80

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