
Concept explainers
To find: The total number of songs which were originally on the players.

Answer to Problem 12GRFC
Explanation of Solution
Given: After adding 15 more songs make the total more than 120 songs.
If the original number of songs on MP3. player is supposed to
Then after adding 15 more songs players should be larger than the 120,
Now by subtracting the added song to find original player on both side.
Hence the number of original songs those were already onMP3 player
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