exam Maths Puzzle Numerical Ability

A solution of 68% fertilizer is to be mixed with a solution of 32% fertilizer to form 108 liters of a 40% solution. How many liters of the 68% solution must be used?

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3x - 2 / 7 - x/4 - x - 3/2 = 1 William is 1/6 as old as his faither but five years older than his sister, Mary. If the sum of all their ages is 51, how old is William?