Question

Mohan bought 8 oranges for Rs. 4.80. If John has Rs. 7.20, how many oranges, more than Mohan, can he buy ?

Answer 1

The cost of oranges is directly proportional to the number of oranges bought.
So, if for $Rs4.8,8$ oranges can be bought, then for $Rs1,\frac{8}{4.8}$ oranges can be bought,
And for Rs $7.2$, number of oranges that can be bought is $7.2\times \frac{8}{4.8}=12$

So, John can buy $12-8=4$ more oranges than Mohan.