Mixed ratio questions

On a school trip the ratio of adults to children should be 1:4. How many adults would be needed for a group of 30 children?

A 150 ml bottle of perfume costs £3.80. A 450 ml bottle costs £9.99. How much do you save if you buy the bigger bottle?

150 g of wholemeal flour is mixed with 600 g of white flour to make a loaf of bread. What is the ratio of wholemeal flour to white flour?

500 ml of concentrated fruit juice is mixed with 2.5 litres of water to make a breakfast drink in a hotel. What is the ratio of concentrate to water?

To make a jam you mix sugar with fruit in the ratio of 3:2. How much fruit do you use in making a 450 g of the jam?

To make a mortar to lay some bricks you mix sand with cement in the ratio of 3:1. How much cement do you use in making a 12 kg of the mortar?

In making enough fruit punch mix for 12 glasses a woman uses 600 ml of orange juice. How much juice would she need to make 48 glasses?

On a college course there are 36 male students and 60 female students. What is the ratio of men to women?

To make an alloy you mix copper with tin in the ratio of 3:4. How much copper do you use in making a 420 g of the alloy?

To make 10 litres of weed killer a gardener adds 120 g of powder. How much powder would he use if he only wanted to make 2 litres?