The number of words maria typed varied directly with the amount of time she spent typing. if she typed 165 words in 3 minutes, how long would it take her to type 495 words?
Dimensional analysis allows us to compute the answer: [tex]\frac{165\text{ words}}{3\text{ minutes}}=\frac{495\text{ words}}{n}[/tex] Cross multiply [tex]n\cdot165\text{ words}=495\text{ words}\cdot3\text{ minutes}[/tex] Divide [tex]n=3\cdot\frac{495}{165}\text{ minutes}=3\cdot3\text{ minutes}=9\text{ minutes}[/tex] It would take her 9 minutes.
