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42/72
factor out a 6
6*7/6*12
eliminate the 6; top and bottom
= 7/12
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simplified
36/42
It is: 84/72 = 7/6 simplified
1/2
18/42 = 3/7
It is: 56/72 = 7/9 by dividing 56 and 72 by their HCF
7/12
one over two
72/42 = 12/7
5/16th
13 over 36
42/48 = 7/8
Yes: 42/105 = 2/5