SOLUTION: A Web music store offers two versions of a popular song. The size of the standard version is 2.8 megabytes (MB). The size of the high-quality version is 4.9 MB. Yesterday,

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Question 1072374: A Web music store offers two versions of a popular song. The size of the standard version is
2.8
megabytes (MB). The size of the high-quality version is
4.9
MB. Yesterday, there were
800
downloads of the song, for a total download size of
2723
MB. How many downloads of the standard version were there?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
Let n be the number of high-quality downloads sold. Then the number of standard downloads would be 800-n. So:
4.9n+2.8(800-n)=2723
4.9n+2240-2.8n=2723
2.1n=483
n=230
800-n=570
There were 230 high-quality downloads, and 570 standard downloads sold yesterday. ☺☺☺☺