exam Maths Puzzle Numerical Ability

A principal of $2500 is invested; part at 8% per annum and the rest at 12% per annum. In one year, the two investments earned equal amounts of interest. How much was invested at each rate?

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exam Other Question

If y varies directly with x, and y = 72 when x = 6, find the constant of variation k. please help me with this particular problem..thanks
Find the constant term or the term independent of x in the expansion of
(3x-5/x^2)^9.

this is a paper given as a study guide.thanks