30 pens and 75 pencil altogether were purchased for Rs., 510. If average price of 75 pencil was Rs.,

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$30$ pens and $75$ pencil altogether were purchased for $Rs.\, 510.$ If the average price of $75$ pencil was $Rs.\, 2$ , then what was the average price of a pen? (in $Rs.$)

A

$9$

B

$10$

C

$11$

D

$12$

Solution

Total price of $75$ pencil $=75 \times 2=$ $Rs. \,150$

Total price of $30$ pens $=510-150=$ $Rs. \,360$

Average price of $30$ pens $=\frac{360}{30}=$ $Rs. \,12$

Standard 13

Quantitative Aptitude

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