Question:A mixture of 40 litres of milk and water contains 10% water. How much water must be added to make water 20% in the new mixture ? 

A 10 litres 
B 7 litres 
C 5 litres 
D 3 litres 

+ Answer
C 

+ Explanation
Milk` = 90/(100) xx 40 = 36`litres, water = 4 litres.

Let x litres of water be added. Then

`((x + 4))/(41 + x) xx 100`

`= 20 => (x + 4)/(40 + x)`

`= 1/5`

`:. 5x + 20 = 40 + x => x = 5.`

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Irin Moni

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