729 ml of mixture contains milk and water in the ratio 7 2 The quantity of water added to get a new ...........

Quantitative Aptitude ( CCS) Ratio, Proportion

729 ml of mixture contains milk and water in the ratio 7 : 2. The quantity of water added to get a new mixture containing milk and watr in the ration 7 : 3 is ?

72 ml

79 ml

81 ml

91 ml

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Explanation:

Quantity of milk in 729 litre of mixture
= 7*729/9 = 567 litre
Quantity of water
= 729-567 = 162 litre.
Let x litre of water be added to become ratio 7:3.

Or, 7/3 = 567/(162+x)
Or, 162*7 +7x = 567*3
Or, 7x = 1701-1134 = 567
Or, x = 567/7 = 81 litre water is to be added.