Book Maths Puzzle Numerical Ability

in mixture of 45 litres the ratio of milk to water is 13:2. how much water must be added to the mixture to make the ratio of milk to water 3:1

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Book Other Question

If the sum of square of two no. is a cube, and
sum of cubes of both no. is a square then what will be two numbers ?
what number should be added to 459045 to make it divisible by 27