A web music store offers

Marketing
Tutor: None Selected Time limit: 1 Day

A web music store offers two versions of a popular song. The size of the standard version is 2.5 megabytes (MB). The size of the high-quality version is 4.9 MB. Yesterday, there were 710 downloads of the song, for a total download size of 2279 MB. How many downloads of the high-quality version were these? 

Jun 16th, 2015

Hi !

Hi !

Let 

x = Standard version

y = 4.9 version

So

x + y = 710            ......................1

2.5x + 4.9y = 2279 ......................2

Multiply the equation 1 by - 2.5, then

- 2.5x - 2.5y = - 1775

2.5x + 4.9y = 2279

Adding them, we get

2.4y = 504

y = 504 / 2.4

y = 210

Now to find x, we put the value of y in any equation (say equation 1), then

x + 210 = 710

x = 710 - 210

x = 500

So 

x = 500 versions of 2.5 MB

y = 210 versions of 4.9 MB

Hope you get it. Thanks :)
Jun 16th, 2015

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