Question

intrun scuar cresc de 4 ori mai putini artari decit stejari in total 30 de copaci?

Answer 1

/---------/  artari
/--------/---------/---------/--------/ stejari
4+1=5 segmente
30:5=6 artari
6x4=24 stejari

deci 6 stejari
       24 artari
proba   6+24=30  copaci

Answer 2

a + s = 30
s = 4a
a + 4a = 30
5a = 30
a = 30 : 5
a = 6 ( artari)
s = 4 x 6
s = 24 ( stejari)