Remark.
The total is going to be a combination of the two fractions. That means add.
Solution
Change both fractions to improper fractions
3 3/4 = 15/4
8 2/3 = 26/3
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Multiply the numerator and denominator of 15/4 by 3
[tex]\dfrac{15}{4} = \dfrac{15*3}{4*3} = \dfrac{45}{12}[/tex]
Multiply the numerator and denominator of 26/3 by 4
[tex]\dfrac{26}{3} = \dfrac{26*4}{3*4}= \dfrac{104}{12}[/tex]
Since the fractions have the same denominator (12), they can be added.
[tex]\dfrac{104}{12}+\dfrac{45}{12} =\dfrac{149}{12}[/tex]
149/12 = 12 5/12 or 5.41667
