### A fruit seller sold big, medium and small sizes apples of Rs. 15, Rs. 10 and Rs. 5, respectively. The total number of apples sold were in the ratio 3 : 2 : 5. Find the average cost of an apple.

A. 8 B. 10 C. 9 D. 7 Answer: Option C

### Solution(By Apex Team)

Let the no. of apples be 3x, 2x and 5x ∴ Average Cost $\begin{array}{l}=\Large\frac{3x\times15+2x\times10+5x\times5}{3x+2x+5x}\\ =\Large\frac{45x+20x+25x}{10x}\\ =\Large\frac{90x}{10x}\\ =\text{ Rs. }9\end{array}$

A. 20
B. 21
C. 28
D. 32

A. 18
B. 20
C. 24
D. 30

A. 10 years
B. 10.5 years
C. 11 years
D. 12 years