A band's members each earn $20 per gig. If there are 4 members and they've earned $400, how many gigs have they played?
The band earns $80 per gig because 4 x 20 = 
<gadget id="calculator">4*20</gadget>
<output>80</output>
80.
They played 5 gigs because 400 / 80 = 
<gadget id="calculator">400/80</gadget>
<output>5</output>
5.

<result>5</result>