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4.Average
medium
A cricketer, whose bowing average was $12.4$ runs/wicket takes $5$ wickets for $22$ runs in a match, thereby decreases his average by $0.4$ The number of wickets, taken by him before this match was
A
$78$
B
$87$
C
$95$
D
$105$
Solution
No. of wickets taken by him before this Match
$\frac{12.5 W +22}{ w +5}=12$
$12.4 w +22=12 w +60$
$.4 W =38$
$W=95$
Standard 13
Quantitative Aptitude