exam Maths Puzzle Numerical Ability

Please help! A company studied the number of lost-time accidents occuring at its Brownsville, Texas, plant. Historical records show that 6% of the employees suffered lost-time acc

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Arianne is mixing a solution for Chemistry class. She has a 25% copper solution and a 50% copper solution. How much of each should she mix to max 1000ml of a 45% solution The sum of two numbers is 40. Their difference is 8. Find the two numbers. How would I set this up to solve it?