To get this answer, you will need to divide both answers by 5 first, because that is the obvious number that will go into both.
385/5= 77
420/5=84
So the new fraction is 77/84. 7 will go into both (it goes into 70, and 70 plus 14(another multiple of 7!) = 84)
77/7=11
84/7=12
385/420 in its simplest form is 11/12!
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