Book Maths Puzzle Numerical Ability

what number should be added to 459045 to make it divisible by 27

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Book Other Question

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 the last digit of A is same as the last digit of its square how many such numbers exist from 0 to 90