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