So, first, let's find a common denominator.
CD = 24
8 x 3 = 24
5 x 3 = 15
12 x 2 = 24
8 x 2 = 16
15/24 & 16/24 are your fractions.
So, let's add 15 + 16.
15 + 16 = 31.
31/24
Mixed number = 1 7/24.
1 7/24 is your answer.
Glad I could help, and good luck!
AnonymousGiantsFan