Bonsoir,
elle a confondu
A: album
S : single
2A + 4S = 60
1A + 2S = 30
1A = 30 -2S
4A + 2S = 96
4( 30 -2S)+2S = 96
120 - 8S +2S =96
120 - 96 = 8S-2S
24 = 6S
S = 24/6
S = 4
2A + 4*4 = 60
2A + 16 = 60
2A = 60-16
2A =44
A = 44/2
A = 22
