- Home
- Standard 13
- Quantitative Aptitude
4.Average
medium
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