Question

Intr-o clasa sint 30 de elevi. Cite fete sint, daca baieti sint cu 2 mai putini decit fete rezolvatii prin ecuatii.............
Alta problema...............................................................................................
Citi calatori erau intr-un tren daca la o statie jumatate dintre ei, au urcat 15 si acum sint 153.
Dar cu x plus x plus 2.......ASA Va rog multttttttttttttttttt

Answer 1

1)
x=nr fete
x-2=nr baieti
x+x-2=30
2x=32
x=16 fete
x-2=16-2=14 baieti

2)
x=nr calatori initial
x/2+15=153
x+30=306
x=306-30=276 calatori erau in tren 

Answer 2

prima problema se rezolva asa x =baieti y=fete x+y=30 x=y-2 se inlocuieste in ecuatie y-2+y=30 2y-2=30 2y=30+2 y=32/2 y=16