729 ml. of a mixture contains milk and water in the ratio

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729 ml. of a mixture contains milk and water in the ratio 7 : 2. How much more water is to be added to get a new mixture containing milk and water in ratio 7 : 3 ?

1. 600 ml
2. 710 ml
3. 520 ml
4. None of these

Correct Option: D

Given :- Quantity of mixture = 729 ml and Ratio of milk and water = 7 : 2

Quantity of Milk =		729 ×	7		= 567 ml
			9

Quantity of Water = (729 – 567) = 162 ml
According to question ,

Now,	567	=	7
	162 + y		3

⇒ 567 x 3 = 7 ( 162 + y ) ⇒ 1701 = 1134 + 7y ⇒ 7y = 567
⇒ y = 81 ml .