###
**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 book is 60% more than the price of the other, what is the price of each of these two books?
**

A. Rs. 5, Rs. 7.50
B. Rs. 8, Rs. 12
C. Rs. 10, Rs. 16
D. Rs. 12, Rs. 14
**Answer: Option C**

## Show Answer

Solution(By Apex Team)

Total price of the two books
= Rs. [(12 × 10) – (11.75 × 8)]
= Rs. (120 – 94)
= Rs. 26
Let the price of one book be Rs. x
Then, the price of other book
$\begin{aligned}&=\text{ Rs. }(x+60\%\text{ of }x)\\
&=\text{ Rs. }\left(x+\frac{3}{5}x\right)\\
&=\text{ Rs. }\left(\frac{8x}{5}\right)\\
&\text{So},\ x+\frac{8x}{5}=26\\
&\Rightarrow13x=130\\
&\Rightarrow x=10\\
&\text{∴ Price of the other book }\\
&=\text{Rs.}\frac{8\times10}{5}\\
&=\text{Rs.}\ 16\end{aligned}$

## Related Questions On Average

### Ajit has a certain average for 9 innings. In the tenth innings, he scores 100 runs thereby increasing his average19 people went to a hotel for combine dinner party 13 by 8 runs. His new average is:

A. 20B. 21

C. 28

D. 32

### Find the average of all the numbers between 6 and 34 which are divisible by 5.

A. 18B. 20

C. 24

D. 30

### In a family, the average age of a father and a mother is 35 years. The average age of the father, mother and their only son is 27 years. What is the age of the son?

A. 10 yearsB. 10.5 years

C. 11 years

D. 12 years

### If the arithmetic mean of 0, 5, 4, 3 is a, that of -1, 0, 1, 5, 4, 3 is b and that of 5, 4, 3 is c, then the relation between a, b, and c is.

A. a = b = cB. a : b : c = 3 : 2 : 4

C. 4a = 5b = c

D. a + b + c = 12