16/7... A simple thumb rule is that if you have two and two sevenths, multiply the natural number with the denominator and add the product to the numerator to get the numerator of the fraction you want...the denominator remains the same. Example, two and one fourths is two times four, which is eight, and then you add one to it to get 9. That is the numerator of the fraction you want, while the denominator remains the same, hence you get 9/4.
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Two and three sevenths is "31/7", read "Thirty-one sevenths" in improper form.
Two and four sevenths as an improper fraction = 12857/5000
Three and four sevenths in an improper fraction is 17857/5000
18/7
15/7