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If two numbers with HCF 9 are in the ratio 5 : 7, what is their difference?
24
8
18
12
let A and B be the number
A:B = 5:7
hcf = 9, the two numbers will be multiplies of 5 and 7
so A = $$5\times 9 = 45$$
    B = $$7\times 9 = 63$$
so difference in the number = 63 - 45 = 18
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