Răspuns :
[tex] \frac{p}{100} [/tex] x 45 = 9
p x 45 : 100 = 9
p x 45 = 900
p = 900 : 45
p = 20
[tex] \frac{20}{100} [/tex] x 45 = 20 x 45 : 100 = 900 : 100 = 9
p x 45 : 100 = 9
p x 45 = 900
p = 900 : 45
p = 20
[tex] \frac{20}{100} [/tex] x 45 = 20 x 45 : 100 = 900 : 100 = 9