Q. A library has an average number of 510 visitor on Sunday and 240 on other days. The average number of visitors per day in a month of 30 days beginning with Sunday is :
Answer: 285
Notes: That month will have 5 sundays. ∴ Required average = $latex = \frac{5 \times 510 + 25 \times 240}{30}&s=1$ $latex = \frac{2550+6000}{30}&s=1$ $latex = \frac{8550}{30} = 285&s=1$ Hence option [A] is correct answer.

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