The income of a man is increased in the ratio 10 : 11. If the increase in his income is ₹ 600 per month, find his new income.

A school collected ₹2100 for charity. It was decided to divide the money between an orphanage and a blind school in the ratio 3 : 4. How much money did each receive?

The sides of a triangle are in the ratio 7 : 5 : 3 and its perimeter is 30 cm. Find the lengths of sides.