exam Maths Puzzle Numerical Ability

A load of 12km stretches a spring to 30cm. A load of 15km stretches it to 40cm. What is the function? What is the unstretched length? What load stretches it to 80cm?

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exam Other Question
Simplify the 3rd root of 16 multiplied by the 4th root of 4 In how many different ways can two black cards be drawn from a standard deck of cards? Assume that the order of the cards matters.