Average of marks of 28 students in Mathematics was 50 . 8 students left school, then this average in

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The average of marks of $28$ students in Mathematics was $50 .$ $8$ students left the school, then this average increased by $5 .$ What is the average of marks obtained by the students who left the school?

A

$50.5$

B

$37.5$

C

$42.5$

D

$45$

Solution

Total marks of $28$ students $=28 \times 50=1400$ Total marks of $20$ students $=20 \times 55=1100$ Total marks of $8$ students $=1400-1100=300$

Average of $8$ students $=\frac{300}{8}=37.5$

Standard 13

Quantitative Aptitude

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