What number should be added to or subtracted from each term of the ratio 17 : 24 so that it becomes equal to 1 : 2 ?
let the number needed to be subtracted from 17:24 be y
hence
$$\frac{17-y}{24-y}$$ = $$\frac{1}{2}$$
34 - 2y = 24 - y
y = 10
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