(60:100)xL=15
60xL:100=15
60xL=1500
L=1500:60 (simplificare prin 10)
L=150:6
L=25
60 % din n = 15
60 / 100 × n = 15
n = 15 × 100 : 60
n = 1500 : 60
n = 25
