Answer: It will take Tracy 21 minutes to type 315 words
Step-by-step explanation:
Set up a proportional relationship to solve for the number of minutes.
45 words = 3 mins
315 words = x mins.
[tex]\frac{45}{315} = \frac{3}{x}[/tex] Cross multiply
45x = 945 Divide both sides by 45
x = 21
