Question

How mamy ways can you add three differemt numbers to get a sum of 20

Answer 1

You could do 6+5+9, or 5+4+11, etc.

Answer 2

You can do 5+5+10, 6+6+8, 9+9+2, 4+4+12, 3+3+14, 2+2+16, 1+1+18. I believe these are all of them, so there are 7 ways.