Elitmus Exam Numerical Ability Averages

a cricketer whose bowling average is 12.4 runs per wicket,takes 5 wickets for 26 runs and thereby decresase his average by 0.4.the number of wickets taken by him till the last match was.

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Ans. 85
Let us assume, that the bowler has taken x wickets with the avg of 12.4
He takes 5 wickets for 26 runs,
No. of wickets= x+5
new avg = 12
12.4x + 26 = 12( x + 5)
x = 34/0.4 = 85
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