# How Much More Water is to be Added ? If

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

- 60 ml
- 81 ml
- 52 ml
- 71 ml

So 7+2 = 9,

729/9 = 81. Assumption, if 81 lit water is added it becomes 7:3 .

So answer is 81 lit.

**Answer: (2) 81 ml**

**Explanation:-**

The ratio of milk and water in a mixture = 7: 2

The total quantity of a mixture = 729ml

Then, the quantity milk = 729 x 7/9 = 567 ml

The quantity of water = 729 – 567 = 162 ml

Let water to be added X ml

Then, 567/(162 + X) = 7/3

X = 18 ml

Hence, the answer is (2) 81 ml.