Question

Intr-o scoala sunt 137 elevi . Daca nr baietilor este cu 23 mai mic decat nr fetelor , aflati nr elevilor ( fete si baieti )

Answer 1

b-baieti
f-fete
-------
b+f=137
b=f-23
=>f-23+f=137
=>2f=137+23
=>2f=160
=>f=160/2
=>f=80

b+80=137
b=137-80
b=57

Proba:57+80=137

Answer 2

b-baieti
f-fete
______
b+f=137
b=f-23
-->f-23+f=137
-->2f=137+23
-->2f=160
-->f=160/2
-->f=80

b+80=137
b=137-80
b=57