Question

Sama and Imran visit a shop to bay books. If each book cost $\frac{21}{2}$, find the cost of $20$ books. If Sam paid $\frac{1}{3}$ of the amount, how much should Imran pay?

Answer 1

Cost of books will be $=\frac{21}{2}\times 20=210$

Sam paid $\frac{1}{3}$ of the total

Imran paid $\frac{2}{3}$ of $210$

So, Imran paid $\frac{2}{3}\times 210=140$