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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 400...

(1/2)x(5/8)=5/16

100/16=6.25

6.25 x 5 = 31.25

In order to answer this question you need to find out how much cement, sand and gravel is needed to make 180kg of concrete mix. To do this you must find out how many parts the concrete mix ratio is made u...

This question asks how students can formulate linear equations from worded questions. 

The first step is to give each person an algabraic symbol. j for John, s for Sandra and k for Kathy works fine...