Stage: 2 Challenge Level: 
This is a $750$ ml bottle of concentrated orange squash.
It is enough to make fifteen $250$ ml glasses of diluted orange drink.
How much water is needed to make $10$ litres of this drink?
Multiplication & division. Working systematically. Calculating with fractions. Fractions. smartphone. Generalising. Calculating with ratio & proportion. Ratio. Factors and multiples. Area.
Published November 2004,December 2004.
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