On average, a machine and a half can produce a widget and a half in 36 hours. How many widgets can three machines give on average in 72 hours? (All machines produce widgets at the same rate.)

The ACT Mathematics Test contains 60 questions to be answered in 60 minutes.  The hardest ACT math questions (the last 10 to 15 questions) fall into two types: advanced concepts and complex questions. Advanced concepts questions cover what you learn in precalculus and trigonometry. FYI: Students that get into Harvard College have an ACT score of 34–36.