3 x 28 = 84
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It depends on whether you mean 28 mm x 28 mm x 3 mm or 28 metres x 28 metres x 3 metres or some other units. Maybe the answer should be 27 and let you figure out 27 lots of what.
1. (28 = 2 x 2 x 7, 45 = 3 x 3 x 5)
% rate= (3/28) x 100%= 0.1071 x 100%= 10.71%
There are 3 factor pairs of 28. 28 = 1 x 28 28 = 2 x 14 28 = 4 x 7
3 x 5 = 15 2 x 3 x 3 = 18 2 x 2 x 7 = 28 2 x 2 x 3 x 3 x 5 x 7 = 1260, the LCM