The average of runs of a cricket player in 10 innings was 32. How many runs must he make in his next innings so as to increase his average of runs by 4?

A) 70

B) 72

C) 74

D) 76

Average = total runs / no.of innings = 32 

So, total = Average x no.of innings = 32 x 10 = 320.

Now increase in avg = 4runs. So, new avg = 32+4 = 36runs 

Total runs = new avg x new no. of innings = 36 x 11 = 396 

Runs made in the 11th inning = 396 – 320 = 76

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