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?

  1. 60 ml
  2. 81 ml
  3. 52 ml
  4. 71 ml
Anurag Mishra Professor Asked on 12th August 2015 in Maths.
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2 Answer(s)

729 into 7:2 parts.
So 7+2 = 9,
729/9 = 81. Assumption, if 81 lit water is added it becomes 7:3 .
So answer is 81 lit.

Dinesh Chandra Default Answered on 16th August 2015.
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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.

Anurag Mishra Professor Answered on 13th September 2015.
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