Ratio and Proportion

If the ratio of boys to girls in a class is 3:4 and there are 21 boys, how many girls are there?

A recipe requires sugar and flour in the ratio 2:5. If you have 10 cups of flour, how much sugar do you need?

In a cricket team, the ratio of batsmen to bowlers is 7:4. If there are 11 players, how many are bowlers?

The ratio of ages of two Bollywood actors is 5:7. If the older actor is 42 years old, what is the age of the younger actor?

If 3 pens cost ₹45, what will be the cost of 7 pens?

Two quantities are in the ratio 4:9. If their sum is 65, what are the quantities?

If 5 kg of rice costs ₹250, how much rice can you buy for ₹400?

A mixture contains milk and water in the ratio 7:3. If the mixture is 50 liters, how much milk is there?