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The number that goes into both 84 and 105 evenly is 21.
The highest common factor of 60 and 84 is 12
The hcf is 14
first you need to think about this problem in terms of an equation: 8.5/100 = x/84 x = (84)*(8.5)/100 84*8.5 = 42+672 = 714 714/100 = 7.14 => 8.5% of 84 = 7.14
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