7/12
42/72 factor out a 6 6*7/6*12 eliminate the 6; top and bottom = 7/12 ------------ simplified
42% of 72 = 42% * 72 = 0.42 * 72 = 30.24
30 + 42 = 72
72 + 72 + 42 = 186
42 will not divide evenly into 72. You an divide 42 into 72 but there will be a fraction.
42/49
It is: 42+30 = 72
72/42 = 12/7
18
In mathematics, "simplify" means to reduce, usually through factoring. If you are asked to simplify the fraction 30/42, find the GCF of 30 and 42 and divide each number by it. Since the GCF of 30 and 42 is 6, the result would be 5/7.
36/42