Need math help with Two numbers are respectively

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Need math help with Two numbers are respectively

  Two numbers are respectively 20% and 50% more than a third number. The ratio of the two numbers is

Seats for Mathematics, Physics and Biology in a school are in the ratio 5 : 7 : 8. There is a proposal to increase these seats by 40%, 50% and 75% respectively. What will be the ratio of increased seats

In a mixture 60 litres, the ratio of milk and water 2 : 1. If this ratio is to be 1 : 2, then the quanity of water to be further added is