Respuesta :

31/8 is the improper fraction
3 ⅞ = 31/8

Explication:
Multiply 3 with 8 to turn the 3 whole points into parts.
3 x 8 = 24
Add the 7 pieces you already have,
24 + 7 = 31

Put it over 8 then you have your answer.

Answer = 31/8


(Now you know how to do it!)
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