If we know that she got 75%, we can write it as the fraction 75/100. We also know that she got 60 correct out of an unknown number of questions, which we can call 'x' We means we know that 75/100 = 60/x (the number of questions) Cross multiply to get an equation. 75 * x=60 * 100 -----> 75x=6000 Divide both sides by 75 to solve for x. 6000/75=80 x=80, meaning that her test had 80 questions on it.
