The average of runs of a cricket player of 10 innings was 42. How many runs must he make in his next inning so as to increase his average of runs by 6?

Let the batsman make x runs. Total runs in 10 innings = 10 × 42 = 420 => (420 + x)/11 = 42 + 6 => 420 + x = 48 × 11 => x = 528 – 420 = 108

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