### The average height of 30 boys out of a class of 50 is 160 cm. If the average height of the remaining boys is 165 cm, the average height of the whole class (in cm) is :

**A.** 161

**B.** 162

**C.** 163

**D.** 164

## Show Answer

###
Answer-B

Solution-

Solution(By Apex Team)

Average height of the whole class
$\begin{array}{l}=\Large\frac{30\times160+20\times165}{50}\\
=\Large\frac{3\times160+2\times165}{5}\\
=96+66\\
=162\mathrm{~cm}\end{array}$