Our small city has two buses.  Each bus can have a capacity of 1/6 as much as the train, which has a capacity of 120 people.  What is the combined capacity of the two buses?
Every bus has a capacity of: 120 * 1/6 = 
<gadget id="calculator">120*1/6</gadget>
<output>20</output>
20 people.
Combined, both the buses have a capacity of 20 * 2= 
<gadget id="calculator">20*2</gadget>
<output>40</output>
40 people.

<result>40</result>