Ratio of Boys to Girls in a Class

If the ratio of boys to girls is 3:5 and there are 20 girls, how many boys are there?

A bakery sells a total of 240 loaves of bread per day. The ratio of whole wheat to white bread is 3:5. How many more loaves of white bread are sold than whole wheat bread?

A bakery sells 1/2 kg of cake for ₹150. How much will it cost to buy 2 kg of cake?

A certain shade of green paint is made by mixing blue and yellow paint in the ratio 3:5. If 12 litres of blue paint are used, how many litres of yellow paint are needed?

A group of friends want to share some money in the ratio 2:3:5. If the total amount is ₹1200, how much will the friend who gets the largest share receive?