Răspuns :
24baieti.......80%
x total elevi...100%
x=(24 x100)/80
x=30 - nr. total de elevi
x total elevi...100%
x=(24 x100)/80
x=30 - nr. total de elevi
prima metoda
80% din nr elevi ...............................24 nr baieti
20% din nr elevi .................................X nr fete 20%·24
X= ------------= 6 fete
80%
Nr elevi = 24+6= 30
A doua metoda
24:80%=24·100/80=30 elevi