exam Maths Puzzle Numerical Ability

Assume that y varies inversely as x. If y = 8 when x = 2.5, find x when y = 2.

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I need help could you show me how to do this problem

Graph the solution set of x > 2 please help my problem solving. (a 165 rope is cut into 3 pieces, the second piece is twice as long as the first. the third is 4 times as long as the second. how long is each piece of rope?) thank you