Let the number of album sold by Imagine dragon be x
Eminem's album sold 0.33 million more copies than Imagine Dragons
This implies that
E = x + 0.33 ------- equation 1
Justin Timberlake albums sold was 0.37 millions less than twice the number of Imagine Dragons' sales
This implies that
T = 2x - 0.37 --------- equation
The three recording artists sold a total of 5.56 millions
abulms
Total sales = Imagine Dragon sales + Eminem's sales + Justin Timberlake sales
5.56 = x + x + 0.33 + 2x - 0.37
Collect the like terms
5.56 = x + x + 2x + 0.33 - 0.37
5.56 = 4x - 0.04
4x = 5.56 + 0.04
4x = 5.6
Divide both sides by 4
x = 5.6 / 4
x = 1.4 millions
Therefore, Imagine dragon sold a total of 1.4 million Albums
For Eminem
E= x + 0.33
E = 1.4 + 0.33
E = 1.73 million
Eminem sold a total of 1.73 million albums
For Justin Timberlake
T = 2x - 0.37
T = 2(1.4) - 0.37
T = 2.8 - 0.37
T = 2.43 million
Justin Timberlake sold a total 2.43 million album.