Minnie is making a playlist of songs for a party she will be throwing. She wants the playlist to be an hour long. She has added 16 three-minute songs to the playlist. How many four-minute songs does she have to add to make sure the playlist is an hour long?
An hour is equal to 60 minutes.
Minnie has 16 * 3 = <<16*3=48>>48 minutes of songs already on the playlist.
She has to fill 60 - 48 = <<60-48=12>>12 more minutes.
Thus, she needs to add 12 / 4 = <<12/4=3>>3 four-minute songs.
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