exam Maths Puzzle Numerical Ability

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An 800 g solution of acid and water contains 128 g of acid. What percent of the solution is acid? 16%

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exam Other Question

9:
(x3 + 4x2 - 2x + 5) - (3x3 - 3x2 + x - 2) How many liters of water must be added to 50 liters of a 30% acid solution in order to produce a 20% acid solution?