Seth is incorrect, because on sale, 1 disc would cost about $0.55.
I figured this out by dividing 5.49 by 10, and got $0.549 which rounds to $0.55.
If this is incorrect, I am sorry, but I am 99.9% sure that I am correct.
Just divide the numbers by the totals to get the percentages
None are left over, as 345/23 = 15, or 15 pieces of paper per classmate.
15
All triangles have 180 degrees. A right angle has 90 degrees. 90+75=165 180-165=15