7 litres mixture of milk and water contains 30% water. 3.5 litres of milk is added to this mixture. What is the percentage of water in the new mixture?
Quantity of mixture = 7 litres
Quantity of water in it = $$\frac{30}{100}\times7=2.1$$ litres
=> Quantity of milk = $$7-2.1=4.9$$ litres
If 3.5 litres of milk is added to this mixture, => Total mixture = $$7+3.5=10.5$$ litres
$$\therefore$$ Percentage of water in the new mixture = $$\frac{2.1}{10.5}\times100$$
= $$\frac{100}{5}=20\%$$
=> Ans - (C)
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