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

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Question

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

Options:

A . 300

B . 290

C . 295

D . 285

Answer: Option D
Answer: (d)That month will have 5 sundays. ∴ Required average= ${5×510+25×240}/30$= ${2550+6000}/30$= $8550/30$ = 285Aliter : Using Rule 10,Here, $n_1$ = 5, $a_1$ = 510$n_2$ = 25, $a_2$ = 240

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