Jeff is collecting matchbox cars. He has twice as many cars as trucks. He has 60 total vehicles. How many trucks does he have?
The number of trucks + 2(number of trucks) = 60.
Therefore 3(number of trucks) = 60.
Number of trucks = 20 because 60 / 3 = 
<gadget id="calculator">60/3</gadget>
<output>20</output>
20.

<result>20</result>