Question

The average price of $10$ books is $Rs.12$ while the average price of $8$ of these books is $Rs.11.75$. Of the remaining two books, if the price of one books is $60$% more than the price of the other, what is the price of each of these two books?

• A. $Rs.12,Rs.14$
• B. $Rs.5,Rs.7.50$
• C. $Rs.8,Rs.12$
• D. $Rs.10,Rs.16$

Answer 1

The correct option is D $Rs.10,Rs.16$

Total Price of $10$ pen $=12\times 10=120$
Price of $8$ pen $=11.75\times 8-94.00$
Price of Remaining $2$ Pen $=120-94=26$
Let Price of $1^{st}pen=x$
Price of $2^{nd}pen=\frac{160}{100}x$
$x+\frac{160}{100}x=26$
$\frac{260}{100}x=26$
$x=10$,
$\frac{160}{100}\times 10=16$
$10$ and $16$.