Question

Ex5. Intr-o pepiniera se planteaza 146 arbori. Brazi sunt de 3ori mai multi decat pini, iar fagi cu 6 mai multi decat brazi. Cati arbori s-au plantat de fiecare fel?

Answer 1

b=brazi
p=pini
f=fagi
|______|p=x
|______|______|______|b=3x
|______|______|______|--| f=3x+6
(notam cu x un segment)
x+3x+3x+6=146
7x=146-6
7x=140
x=20(pini)
20x3=60 brazi
60+6=66 fagi
verificare:
20+60+66=146 arbori