Last year, Megan put off completing 6 of 10 assignments during Procrastination Week. She wants to have the same ratio of not completed to completed assignments this year. If the teacher gives her 15 assignments this year, how many should she complete to keep the ratio the same?

Answer 1

Because 6/10 = x/15 all we need to do is cross-multiply. Doing so yields 10x = 90. Dividing both sides by 10 gives x = <<9=9>>9. Answer: \boxed{9}.