There are 90 rooms at the KozyInn Motel. It takes housekeeping 20 minutes to clean each room. How many hours would it take to clean one-half of the rooms?
90 * 20 = 
<gadget id="calculator">90*20</gadget>
<output>1_800</output>
1800 minutes
1800/2 = 
<gadget id="calculator">1800/2</gadget>
<output>900</output>
900 minutes
900 minutes = 
<gadget id="calculator">900/60</gadget>
<output>15</output>
15 hours.
It would take 15 hours to clean 45 rooms at the KozyInn Motel.

<result>15</result>