Jay went to watch a singer in a one hour 20 minutes concert.  If there was a 10-minute intermission, and all the songs were 5 minutes except for one song that lasted 10 minutes, how many songs did she sing?
The time the singer had for singing was 80 - 10 = <<80-10=70>>70 minutes.
The time the singer had for singing 5-minute songs was 70 - 10 = 60 minutes.
The number of 5-minute songs was 60 / 5 = <<60/5=12>>12 songs.
The total number of songs sung is 12 + 1 = <<12+1=13>>13 songs.
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