Subject: General Aptitude · Chapter: Average · Exam: · Marks: · Difficulty:
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)276
(c)280
(d)285
Answer
Answer (as printed): D
Explanation
Since the month begins with a Sunday, so there will be five Sundays in the month. $$\text { ∴ } \text { Required average }=\left(\frac{510 \times 5+240 \times 25}{30}\right)=\frac{8550}{30}=285 .$$
Explanation as extracted from the printed page; notation may be imperfect.