## Basic College Mathematics (9th Edition)

336 hr = wk Use the unit fraction $\frac{1 day}{24 hours}$ to change hours to days and the unit fraction $\frac{1 week}{7 days}$ to change days to week. Notice how all the units divide out except week, which is the unit you want in the answer. 336 hr * $\frac{1 day}{24 hours}$ * $\frac{1 week}{7 days}$= 2 weeks.