Răspuns :
Notam cu:
x-apartamente cu 2 camere
y-apartamente cu 3 camere
x+y=60=> x=60-y
2(60-y)+4y=190
120-2y+4y=190
2y=70=> y=35
x=60-35=>x= 25
x-apartamente cu 2 camere
y-apartamente cu 3 camere
x+y=60=> x=60-y
2(60-y)+4y=190
120-2y+4y=190
2y=70=> y=35
x=60-35=>x= 25
X+Y =60 APARTAMENTE ; x=60-y
2x+4y =190 camere
2( 60-y) +4y = 190
120-2y +4y =190
2y =190-120
2y =70
y =35 apt . cu 4 camere
x =60-y
x =60-35 =25 apt. cu 2 camere
verif ; 25+35 =60
2*25+4*35 =50+140 =190
2x+4y =190 camere
2( 60-y) +4y = 190
120-2y +4y =190
2y =190-120
2y =70
y =35 apt . cu 4 camere
x =60-y
x =60-35 =25 apt. cu 2 camere
verif ; 25+35 =60
2*25+4*35 =50+140 =190