Give the step-by-step reasoning process and then the final answer. 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?
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An hour is equal to 60 minutes. Minnie has 16 * 3 = 48 minutes of songs already on the playlist. She has to fill 60 - 48 = 12 more minutes. Thus, she needs to add 12 / 4 = 3 four - minute songs.
The final answer: 3.
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