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- Quantitative Aptitude
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