mixture problem

Question

A Web music store offers two versions of a popular song. The size of the standard version is 2.1

 megabytes (MB). The size of the high-quality version is 4.2

 MB. Yesterday, there were  1150

 downloads of the song, for a total download size of 4242

 MB. How many downloads of the standard version were there? 

Answer 1

s + h = 1150

2.1s +4.2s = 4242

6.3s =4242

s=4242/6.3= 14140/21=2020/3

=673 1/3 standard downloads

h=476 2/3 high quality downloads

h = -264