Question

If the area occupied by $15$ postal stamps is $60c{m}^2$ then the area occupied by $120$ such postal stamps will be $\_\_\_\_\_\_\_$

Answer 1

Find the area using unitary method

The area occupied by $15$ postal stamps $=60c{m}^2$

Area occupied by $1$ postal stamps $=\frac{60}{15}=4c{m}^2$

$\therefore$The area occupied by $120$ postal stamps $=120\times 4=480c{m}^2$

Hence, the required area is $480c{m}^2$ by $120$ postal stamps.