Noah was assigned to make 64 cookies or the bake sale. He made 125% of that number. 90% of the cookies he made were sold. How many of Noah's cookies were left after the bake sale?

Answer 1

64 x 125% = <<64*125*.01=80>>80 cookies
80 x 90% = <<80*90*.01=72>>72 cookies
Noah had 72 - 72 = <<72-72=0>>0 cookies left. Answer: \boxed{0}.