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?
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}.
Noah was assigned to make 64 cookies for the bake sale.
He made 125% of that number, which is 64 * 125/100 = 80 cookies.
90% of the cookies he made were sold, so 90/100 * 80 = 72 cookies were sold.
Therefore, Noah had 80 - 72 = 8 cookies left after the bake sale.
To find out how many of Noah's cookies were left after the bake sale, we need to follow a few steps.
Step 1: Calculate the number of cookies Noah made.
Noah was assigned to make 64 cookies, but he made 125% of that number. To calculate this, we need to find 125% of 64.
125% of 64 = (125 / 100) * 64 = 0.125 * 64 = 80 cookies
So, Noah made 80 cookies.
Step 2: Calculate the number of cookies sold.
We know that 90% of the cookies Noah made were sold. To calculate this, we need to find 90% of 80.
90% of 80 = (90 / 100) * 80 = 0.9 * 80 = 72 cookies
So, 72 cookies were sold.
Step 3: Calculate the number of cookies left after the bake sale.
To find the number of cookies left, we subtract the number of cookies sold from the total number of cookies Noah made.
80 cookies - 72 cookies = 8 cookies
Therefore, there were 8 of Noah's cookies left after the bake sale.