exam Maths Puzzle Numerical Ability

If y varies directly with x, and y = 72 when x = 6, find the constant of variation k.

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Can you work out a fair way to have 10 people choose from approximately 100 items - for instance 1- 10 the first draw then 10 - 1 second draw etc that would give a different posit 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?