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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.

$x_i$	$5$	$15$	$25$	$35$	$45$	$55$
$f_i$	$12$	$18$	$27$	$20$	$17$	$6$

Class	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$
$f_i$	$8$	$30$	$40$	$12$	$10$

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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