Problem Solving (PS) | Re: 729 liters of a mixture contains milk and water in the ratio 7:2.

Qty of water = 2/9*729 = 162 liters
Qty of milk = 729 - 162 = 567 liters

Let the water be added = x liters
Total volume = (729 + x) liters

Milk : Water = 7 : 3
Fraction of milk = 7/10
—> 567/(729 + x) = 7/10
—> 81/(729 + x) = 1/10
—> 810 = 729 + x
—>
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