Question

six boys each contribute R155,50 towards a tent.how much should each boy contribute if there were 10 boys in the group

Answer 1

The total contribution towards a tent(T) = No. of boys(n) x Contribution of each                                                                                            boy(c)
Case 1:
n= 6 ; c = Rs 15550
So, T = n x c = 6 x 15550
         = Rs 93300
Case 2:
n = 10 ; T = Rs 93300
As T = n x c 
     c = T / n = 93300 / 10
        = Rs 9330
Hence, 9330 is the answer.

Answer 2

Six boys contributed Rs 155.50 (I understood it this way) each.

total collected = 6 × 155.50 = Rs 933

Contribution by 10 boys = $\frac{933}{10}$ = Rs 93.30