It is 31/8.
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To rename a mixed number to a fraction, you multiply the number outside the fraction by the denominator (the lower part of the fraction), and then you add that number to the numerator (higher number of the fraction). If you need to turn 2 3/4 into a fraction, you do this: 2*4=8, 8+3=11, so 2 3/4=11/4 as an improper fraction.
31/83 7/8:= [(8 * 3)+7]/8= [24 + 7]/8= 31/8 in improper fraction
7/8
31/8