Question 1081770
Let m be the amount of standard-version downloads, and n be the number of high-quality downloads. Then:
m+n=890
2.1m+4.4n=2536
So:
2.1m+4.4n=2536
2.1m+2.1n=1869
2.3n=667
n=290
m=600
There were 600 standard downloads and 290 high-quality downloads of the song. ☺☺☺☺