exam Maths Puzzle Numerical Ability

One solution contains 10% alcohol while another contains 30% alcohol. How many liters of each should be mixed to give 10 L of a solution which is 25% alcohol?

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If 2x - 3y = 0 and 3x + 2y = 13, find x + y. Do I solve for x and y and then just add them. Please show me. 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?