### The average height of 25 boys is 1.4 m. When 5 boys leave the group, then the average height increased by 0.15 m. What is the average height of the 5 boys who leave ?

A. 0.8 m

B. 0.9 m

C. 0.95 m

D. 1.05 m

$\begin{array}{l}\text{Sum of height of the 5 boys}\\ \text{= (25 × 1.4 – 20 × 1.55) m}\\ \text{= 4 m}\\ \text{∴ Required average}\\ =\left(\Large\frac{4}{5}\right)\\ =0.8\ \text{m}\end{array}$