### If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is:

**A.** 53.33

**B.** 54.68

**C.** 55

**D.** None of these

## Show Answer

### Answer-B

Solution-

__Solution(By Apex Team)__

$\begin{array}{l}\therefore\text{Required average }\\
=\Large\frac{55\times50+60\times55+45\times60}{55+60+45}\\
=\Large\frac{2750+3300+2700}{160}\\
=\Large\frac{8750}{160}\\
=54.68\end{array}$