a batsman scored 135 runs in his 20 th innings and increased his average by 5 runs. find his average after 20th innings.
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average after 19 innings is , y = x/19
where x= total runs after 19 innings
runs scored in 20th innings is 135
So, the average after the 20th innings is given by, (x+135)/20 = y+5
Solving the above equation we get, x= 665 and y=35
Therefore, the average after 20 innings is = 35+5 = 40
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