book Maths Puzzle Numerical Ability

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???????????

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book Other Question

3w =w.3 How would I solve the inequality of x - 7/x + 2 < 0. I came up with the answer to this problem -2 < x < 7.