The Diving Club offers 2 beginning diving classes on weekdays and 4 beginning classes on each day of the weekend. Each class has room for 5 people. How many people can take classes in 3 weeks?
There are 2 classes x 5 days = 
<gadget id="calculator">2*5</gadget>
<output>10</output>
10 classes on weekdays.
There are 4 classes x 2 days = 
<gadget id="calculator">4*2</gadget>
<output>8</output>
8 classes on weekends.
There are a total of 10 + 8 = 
<gadget id="calculator">10+8</gadget>
<output>18</output>
18 classes per week.
So each week, 18 x 5 = 
<gadget id="calculator">18*5</gadget>
<output>90</output>
90 people can take classes.
Thus, 90 x 3 = 
<gadget id="calculator">90*3</gadget>
<output>270</output>
270 people can take classes in 3 weeks.

<result>270</result>