Question

Intr-o excursie participa 80% elevi,5% profesori si 6 studenti.Cati elevi si cati profesori au fost in excursie?

Answer 1

6 studenti reprezinta 15% din participantii la excursie => participa 40 persoane (6x100/15)
Cu regula de trei simpla avem
40pers________100%
x_____________80%
x=32 elevi
y=2profi

Answer 2

80% elevi=80/100*x=0,8*x
5% profesori=5/100*x=0,05*x

x=0,8x+0,05x+6
x-0,8x-0,05x=6
0,15-x=6
x=40 elevi in total

80/100*40=32 (nr. de elevi)
5/100*40=2 (nr. de profesori)

Succes!