<human>:  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?
<bot>: How much is spent on advertising in the second year? ** 15000/3 = <<15000/3=5000>>5,000 is spent on advertisement in the second year.
What's the total amount the company spent on advertising for the two years? ** The total on advertisement for the two years is 15000+5000 = <<15000+5000=20000>>20000 dollars.
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