Answer:

55 7/24

Step-by-step explanation:

45+9 = 54

8=8,16,24

12=12,24

LCD=24

7/8 = 21/24 (24÷8=3x7=21)

5/12=10/24 (24÷12=2x5=10)

21/24 + 10/24 = 31/24

Simplifying the fraction

31/24 = 1 7/24

54+1=55+ 7/24 =55 7/24