exam Maths Puzzle Numerical Ability

The lesser of two consecutive even integers is 10 more than one-half the greater. What are the integers?

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(3a^2-23/4a-5) divided by (4a+3) A chemist wants to mix a 60% saline solution with 20 liters of a 45% saline solution to obtain a 55% saline solution. How much of the 60% solution should she use?