Răspuns :
20×n/100 = 30
20×n = 30×100
20×n = 3000
n = 3000:20
n = 150 (numarul)
30×150/100 = 30×15/10 = 3×15 = 45
20×n = 30×100
20×n = 3000
n = 3000:20
n = 150 (numarul)
30×150/100 = 30×15/10 = 3×15 = 45