Answer:
105 11/12
Step-by-step explanation:
With mixed numbers you can also write them as functions so 5 11/12 could also be written as 5+11/12.
Once you have rewritten the mixed number it's simply a matter of addition: 100+5+11/12
17.5 is the answer
You add them all together and divide it by the total numbers there are.
(15*16*17*18*19*20)/6
=105/6
=17.5