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(C) Let the man spend $x$ Rs on each type of pen.The number of pens bought at $5$ Rs/pen is $\frac{x}{5}$.The number of pens bought at $10$ Rs/pen is

Vedclass · Accepted Answer

$\frac{60}{7}$ Rs

Vedclass · Answer

(C) Let the man spend $x$ Rs on each type of pen.The number of pens bought at $5$ Rs/pen is $\frac{x}{5}$.The number of pens bought at $10$ Rs/pen is $\frac{x}{10}$.The number of pens bought at $20$ Rs/pen is $\frac{x}{20}$.Total cost = $x + x + x = 3x$.Total number of pens = $\frac{x}{5} + \frac{x}{10} + \frac{x}{20} = \frac{4x + 2x + x}{20} = \frac{7x}{20}$.Average cost per pen = $\frac{	ext{Total cost}}{	ext{Total number of pens}} = \frac{3x}{\frac{7x}{20}} = 3x 	imes \frac{20}{7x} = \frac{60}{7}$ Rs/pen.

Marks obtained	No. of students
$0-10$	$2$
$10-20$	$18$
$20-30$	$30$
$30-40$	$45$
$40-50$	$35$
$50-60$	$20$
$60-70$	$6$
$70-80$	$3$

If a man spends an equal amount of money to buy three types of pens at $5$ Rs/pen,$10$ Rs/pen,and $20$ Rs/pen,what is the average cost per pen?

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