exam Maths Puzzle Numerical Ability

A student has test scores of 90, 74, 82, and 90. The next test in the fianl examination, which will count as two test. What score does the student need on the final examination to produce an average score of 85

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exam Other Question

One number is 12 more than another. The sum of the smaller number and twice the larger is 39. Find the larger number. What amount of each mixture, one 95% alcohol and the other 15% alcohol, must be used to make 10 liters of a mixture which is 45% alcohol? What equations will express this problem?