A batsman has a certain average in 11 innings. In 12^{text {th }} innings, he scores 90 runs and his

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4.Average

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A batsman has a certain average in $11$ innings. In the $12^{\text {th }}$ innings, he scores $90$ runs and his average decreases by $5 .$ After the $12^{\text {th }}$ innings what is his average?

A

$145$

B

$130$

C

$135$

D

$140$

Solution

Let the average of $11$ innings $=x$

Total run of $11$ innings $=11 x$

After $12$ innings

$11 x+90=(x-5) 12 \Rightarrow 12 x-11 x=90+60 \Rightarrow x=150$

Average after $12^{th}$ innings $=150-5=145$

Standard 13

Quantitative Aptitude

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