A 25 story building has 4 apartments on each floor. If each apartment houses two people, how many people does the building house?
If each building floor has 4 apartments, we have 25 floors * 4 apartments/floor = 
<gadget id="calculator">25*4</gadget>
<output>100</output>
100 apartments.
If each apartment has 2 people, 100 apartments * 2 people/apartment = 
<gadget id="calculator">100*2</gadget>
<output>200</output>
200 people.

<result>200</result>