exam Maths Puzzle Numerical Ability

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Mr. Irwin and Ms. Lippi are math teachers. They have a total of 46 years of teaching. Two years ago Mr. Irwin had taught 2.5 times as many years as Ms. Lippi. How long has each taught? mix a solution that is 40% acid with a solution that is 100% water to make 16L of a solution that is 10% acid. How much of each solution should you use?