A glass of this drink is prepared by mixing 20 millilitres of orange juice with water.
(a)[1]
Anna uses $9$ ml of water for every $1$ ml of orange juice. Work out the volume of drink in this glass.
(b)[1]
Tariq has $2$ litres of orange juice. He uses all of the orange juice to make glasses of this drink. Work out the number of glasses that he makes.
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