Mixtures & Allegations Mcqs

Q.  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?

a. 2
b. 8
c. 4
d. 5
e. None of these


ANSWER: See Answer
 
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 => x = 72
Hence 72 – 70 = 2 litres of water must be added.
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