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4.Average
easy
A batsman has an average of $30$ runs in his $42$ inning. The difference between his maximum and minimum score is $100 .$ If these two innings are removed his average for $40$ innings comes down to $28 .$ What is his minimum score?
A
$20$
B
$30$
C
$45$
D
$40$
Solution
Total runs of $42$ innings $=42 \times 30=1260$ Total run excluding min and max inning $=40 \times 28=1120$
$\max +\min =1260-1120=140$ $…..(i)$
$max – min =100$ $……(ii)$
On solving $(i)$ & $(ii)$ $\max =120, \quad \min =20$
Hence, minimum score is $20 .$
Standard 13
Quantitative Aptitude