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Question 1:
A 50 litres mixture of milk and water contains 10% water. 10 litres of this mixture is replaced by 10 litres of milk.
What is the percentage of water in the final mixture?
A. 9%
B. 8%
Feedback When 10 litres taken out, quantity of mixture left =50-10=40, so
milk left = 90/100 *40 = 36
And water left = (10/100)*40 = 4
now 10 litres of milk poured in, so there is no change in quantity of water, and total mixture again becomes 50l
so water now is 4/50 * 100 = 8%
C. 7%
D. 8.5%

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