30. If the ratio of milk to water is 3:4 in a 63 litre mixture, then how many litres of water is to be added to make the ratio 4:7

1 thought on “30. If the ratio of milk to water is 3:4 in a 63 litre mixture, then how many litres of water is to be added to make the ratio 4:7”

1. Answer:

   Milk to Water

   3 : 4

   Milk + Water = 3 + 4 = 7

   So milk is 3/7 x 63 = 27 litres, and

   Water is 4/7 x 63 = 36 litres

   Let additional Water required be A for

   New ratio required 4 : 7

   Total water = 36 + A

   Milk Water in new Ratio = 4 : 7

   27 / 4 = (36 + A) / 7

   A = 27 x 7 / 4 – 36

   = 47.25 – 36 = 11.25 litres

   Water required is 7/11 x 27

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