Question: Explain how to solve this math problem: John buys a cassette with 2 songs.  The first song is 5 minutes and the second song is 60% longer.  How much time was the total cassette?
Answer: 
The second song is 5*.6=3 minutes longer than the first
So the second song was 5+3=8 minutes
That means the total time was 5+8=13 minutes