Răspunsuri

2014-04-15T13:54:27+03:00
26-5=21
21:3=7=>nr. baietilor
7*2=14
14+2=16

R=16 fete
Cel mai inteligent răspuns!
2014-04-15T13:58:12+03:00
F+b=26
f-2=2(b-3)
f-2=2b-6
f-2b=-6+2=-4
f+b=26  o inmultim cu -1

f-2b=-4
-f-b=-26
 prin adunarea celor 2 ecuatii obtinem
/-3b=-30
3b=30
b=10   f=16