A library has an average of 510 visitors on Sundays and 240 on other days. average number of visitor

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4.Average

medium

A library has an average of $510$ $visitors$ on Sundays and $240$ on other days. The average number of visitors per day in a month of $30 \,days$ beginning with a Sunday is

A

$250$

B

$275$

C

$280$

D

$285$

Solution

In a month starting with Sunday, there will be $5$ Sundays and $25$ week days

$\therefore \quad \text { Average visitor/day }=\frac{5 \times 510+25 \times 240}{30}=5 \times 17+25 \times 8=85+200=285$

Standard 13

Quantitative Aptitude

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