exam Maths Puzzle Numerical Ability

One number is 12 more than another. The sum of the smaller number and twice the larger is 39. Find the larger number.

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exam Other Question

I have the following problem; Write the equation of the line which passes through the point (2,1) and is parallel to the equation y = 5/2x + 6. My answer is y= 5/2x - 1 is this correct? Please help. 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