<human>:  At a birthday party, there are 20 red balloons and 15 green balloons. Before the party started, 3 red and 2 green balloons burst. How many balloons are left?
<bot>: How many balloons are there? ** There are a total of 20 + 15 = <<20+15=35>>35 balloons at the party.
How many balloons burst? ** Out of the 35, 3 + 2 = 5 balloons burst.
How many balloons are left? ** Thus, only 35 - 5 = <<35-5=30>>30 balloons are left.
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