add them together then divide by 5
81 +86 +81 +76 +71 = 395
395/5 = 79
your average was 79
20& 10/35 - 26/35
19& 16/35 simplified to it's fullest.
If you mean the question 3p=0.064 then to find the answer you divide 0.064 by 3 to get 0.213333.....
Got this and not sure but best luck with your studying
