A trader bought 40 shirts for Birr 220 and sold them at Birr 72 each
Find the profit percentage.

What is the smallest integer n such that n\sqrt{2} is greater than 20

In a certain pentagon, the interior angles are a, b,c, d,e where a, b,c, d,e are integers strictly less than 180. ("strictly less than 180" means they are "less than and not equal to" 180.) if the median of the interior angles is 61 and there is only one mode, then what are the degree measures of all five angles?

Which of the symbols correctly relates the two numbers below check all that apply 6? 6