To find two numbers that add up to 80, we can set up an equation x + y = 80, where x and y are the two numbers. There are infinitely many pairs of numbers that satisfy this equation, but a common pair would be 40 and 40. Another pair could be 50 and 30, or 60 and 20. These pairs all add up to 80.
82
82
80
Well, let's take a moment to appreciate these numbers, each one unique and special in its own way. To find the mean, we add them all together and then divide by how many numbers there are. So, by adding 60 + 72 + 80 + 80 + 98 and dividing by 5, we find that the mean is 78.
1680
51 + 29 = 80
(8²)64 + (4²)16 = 80
-1
16 and 64
They are 40 and 40
84
73, 5 and 2
82
1+2+3+5+11+17+41 = 80
82
There aren't two whole numbers that satisfy those conditions. If that was -80, you could use 8 and -10.
17, 19, 21 and 23.