book Maths Puzzle Numerical Ability

-1/3 < -1/4x + 1/8 < 5/8

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A chemist needs 10 liters of a 25% acid solution. The solution is to be mixed from three solutions whose concentrations are 10%, 20%, and 50%. How many liters of each solution sh how many pints of a 40% salt solution must be added to 12 pint of a 20% salt solution to end up with a 32% salt sollution