Multiple Choice Questions

The average of 15 results is 21 The average of the first 7 of those is 21 and the average of the las...........

Quantitative Aptitude (CPO) Average

The average of 15 results is 21. The average of the first 7 of those is 21 and the average of the last 7 is 20. What is the 8^TH

result?

This questions was previously asked in

SSC CPO 10th Nov 2022 Shift 2

- The total sum of all 15 results is 315 (21 average * 15 results).

- The sum of the first 7 results is 147 (21 average * 7 results).

- The sum of the last 7 results is 140 (20 average * 7 results).

- Let the 8th result be $x$ .

- The equation is: 147 + 140 + $x$ = 315.

- Simplifying gives: 287 + $x$ = 315.

- So, $x$ = 28.

The correct option is:

- Option 3: 28

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