Callum mixes a drink such that the Fruit Juice and Water is a ratio of 1:4 respectively. Calculate how much of both the Fruit Juice and the Water Callum will need in order to make 2 litres of juice. (Water: ____ml, Fruit Juice: ____ml )

A ratio of 1:4 means there are 5 parts to the mixture.
2 litres of drink divided into 5 parts means there are 400 ml per part (2000ml/5 parts).
As Fruit Juice has 1 part, Callum would need 400ml.
As Water has 4 parts, Callum would need 400 ml multiplied by 4 which is 1600ml.
Checking: If the answers have been calculated correctly, the total amounts of each liquid should add up to 2000ml (2 litres)
400ml + 1600ml = 2000 ml = 2 litres