book Maths Puzzle Numerical Ability

3w =w.3

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What is the formula to solve this?


The Perimeter of a rectangle is 600. The length of the rectangle is 2 more than 3 times the width.
if y varies inversly as x and y=24 when x=8 find y when x=4
y=_____
Thank you can sum one teach me this??????please???????????