Arturo O. answered 09/19/17
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You have 2 different numbers in the problem statement: 4.625 and 4.6625
I will work this for the first one.
4.625 = 4 + 625/1000
You can simplify 625/1000:
625 = 54
1000 = 8 x 53
625/1000 = 54/(8 x 53) = 5/8
4.625 = 4 5/8