A Web store offers two versions of a popular song. The size of the standard version is 2.7 megabytes. The size of the high quality is 4.4 MB. Yesterday, there were 990 downloads of the song, for a total download size of 3268 MB. How many downloads of the standard version were there?

Question

kaitlyn_nicole · Answer

@krisssssssssssss @sweetburger @Ellie201

zyberg · Answer

Try to make up a system of equations: 
x - standard; y - high quality;

x + y = 990;
2.7x + 4.4y = 3268;

Is it clear what to do next?

kaitlyn_nicole · Answer

would you plug in 0 for x and solve for y?

zyberg · Answer

@kaitlyn_nicole, no, you don't need to assume any zeroes. Just solve y in terms of x and plug that in the second equation:
y = 990 - x
2.7x + 4.4(990 - x) = 3268. 
You should be able to solve this equation :)