Anybody good with word problems? This is from my daughter's 8th grade math homework and I'm drawing a blank on how to do it. Here it is: A math test has 2 problems. The first was solved by 70% of the students. The second was solved by 60% of the students. Every student solved at least one of the problems. 9 students solved both problems. How many students took the test? If you figure it out, please tell me how you did it, too! Thanks!