X + 60 = 2000X = 2000 - 60X = 1940
720 : X = 20720 = 20 XX = 720 / 20X = 36
350 : X = 20350 = 20 XX = 350 / 20X = 17.5
X × 30 = 150X = 150 / 30X = 5
X + 60 = 2000
X = 2000 - 60
X = 1940
720 : X = 20
720 = 20 X
X = 720 / 20
X = 36
350 : X = 20
350 = 20 X
X = 350 / 20
X = 17.5
X × 30 = 150
X = 150 / 30
X = 5