### The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg. Find the average weights of all the boys in the class.

A. 47.55 kg.

B. 48 kg.

C. 48.55 kg.

D. 49.25 kg.

$\begin{array}{l}\therefore\text{ Required average }\\ =\Large\frac{50.25\times16+45.15\times8}{16+8}\\ =\Large\frac{804+361.20}{24}\\ =\Large\frac{1165.20}{24}\\ =48.55\mathrm{~kg}\text{ . }\end{array}$