book Maths Puzzle Numerical Ability

the sum of two consecutive odd integers is 40 find the numbers

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The nurse has 0.56 liters of a solution that is 89.9% alcohol. How much pure alcohol must she addd to bring the solution up to a 95.8% concenration? I cannot translate these proble change 7 over 250 ( this is a fraction) to a decimal number and round to three decimal places