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Question 1:
90 litres of a mixture of milk and water contains 20% water.
How much water should be added so that the mixture has 28% water ?
A. 8 Litres
B. 18 Litres
C. 12 Litres
D. 10 Litres
Feedback Quantity of water = 90*20/100 = 18
=> 18+x/90+x = 28/100
=>1800+100x = 2520+28x
=>72x = 720
X = 10 Litres

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