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A cricketer's average in his first 20 innings was 15 runs per innings.

After a further 10 innings, his average had increased to 17 runs per innings.

What was his average for the last 10 innings?

[Ref: ZGTM]

21 runs per innings.

In the first 20 innings the total runs was 20 x 15 = 300 runs.

After 30 innings the total runs was 30 x 17 = 510 runs = a difference of 210 runs.

Therefore the final 10 innings had an average of 210 ÷ 10 = 21. QED.

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