intr-o excursie merg 80% elevi , 5% profesori si 6 studenti. Cati elevi si cati profesori merg in excursie ?

80%+5%=85% -elevi + profesori
100%-85%=15%=6 studenti
15%.x=6
15x=600
x=600:5=40 totalul excursionistilor
40.80/100=32 elevi
40.5/100=2 profesori 

Elevi+profesori+studenti=100%
80% +    5%      +x%=100%
           85% + x% =100%
              x%=100%-85%
              x%=15%
              x=15(reprezinta cat la suta sunt studenti)

6 ............................... 15%
y..................................5%
y=(5%*6):15%
y=30%:15%
y=30%*100/15
y=2(numarul profesorilor)

80%..........................z
5%.............................2
z=(2*80%)/5%
z=160%/5%
z=160%*100/5
z=32(numarul elevilor)