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Maths Puzzle
Numerical Ability
6x+(5x-8
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This word problem has me stumped. Can you help?
How much water must be evaporated from 240 gallons of a 3% salt solution to
produce a 5% salt solution?
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