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Anonymous
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21.5
5/43 divided by 25/86 is the same as 5/43 times 86/25. So that's (5 X 86)/(43 X 25) = 430/1,075
47.7778
hcf(520, 430) = 10 520 = 23 x 5 x 13 430 = 2 x 5 x 43 hcf = 2 x 5 = 10
430