A mixture of 70 litres of milk and water contains 10% water. How many litres of water should be added to the mixture so that the mixture contains 12 1/2% water?  Pick one.
A) 2  B) 5  C) 9  D) 7  E) 9
Quantity of milk in the mixture = 90/100 (70) = 63 litres.   After adding water, milk would form 87 1/2% of the mixture.   Hence, if quantity of mixture after adding x liters of water, (87 1/2) / 100 x = 63 =&gt; x = 72   Hence 72 - 70= 
<gadget id="calculator">72 - 70</gadget>
<output>2</output>
2 litres of water must be added.   2nswer: 2
<result>A</result>
A mixture of 70 litres of milk and water contains 10% water. How many litres of water should be added to the mixture so that the mixture contains 12 1/2% water?