A company spends $15000 on advertising for a year, and then spends a third of that amount on advertising for another year.  What's the total amount the company spent on advertising for the two years?
15000/3 = 
<gadget id="calculator">15000/3</gadget>
<output>5_000</output>
5,000 is spent on advertisement in the second year.
The total on advertisement for the two years is 15000+5000 = 
<gadget id="calculator">15000+5000</gadget>
<output>20_000</output>
20000 dollars.

<result>20_000</result>