A sum of Rs. 41 was divided among 50 boys and girls. Each boy gets 90 ps and each girl gets 65 ps. Find the number of boys:

Solution:  Average money received by each $=\frac{41}{50}=82paisa$

Ratio of  boys and girls = 17 : 8

$\begin{array}{l}Total\to 25parts\to 50\\ 1part\to 2\\ Thennumberofboys=17\times 2=34\end{array}$