Răspuns :
Notam copiii cu 'c' , tinerii cu 't' si varstnicii cu ' v ' .
c+t+v = 432
t = 12 + c
v = 2c
Apoi inlocuim : c + 12+c+2c = 432 t = 12 + c
4c + 12 = 432 t = 12 + 105
4c = 432 - 12 t = 117
4c = 420
c = 420 : 4 v = 2c
c = 105 v = 2*105
v = 210 .
c+t+v = 432
t = 12 + c
v = 2c
Apoi inlocuim : c + 12+c+2c = 432 t = 12 + c
4c + 12 = 432 t = 12 + 105
4c = 432 - 12 t = 117
4c = 420
c = 420 : 4 v = 2c
c = 105 v = 2*105
v = 210 .
C.I____I
V .I____I____I
T. I____I12I
432-12=420
420:4=105 ( copii )
105x2=210 ( varstnici )
105+12=117 ( tinerii )
117+210+105=432
V .I____I____I
T. I____I12I
432-12=420
420:4=105 ( copii )
105x2=210 ( varstnici )
105+12=117 ( tinerii )
117+210+105=432