Question

am 70 de apartamente cu2 camere si 4camere in total 260 de camere cate apartamente cu 2 camere am?dar cu 4

Answer 1

a+b=70=>a=70-b
2a+4b=260
2(70-b)+4b=260
140-2b+4b=260
2b=260-140
b=120:2=>b=60 ap.cu 4 camere
a=70-60=>a=10 ap. cu 2 camere

Answer 2

a+b=70 apartamente
a=70-b
2a+4b=260  camere
2(70-b)+4b=260
140-2b+4b=260
2b=260-120
2b=120
b=120:2
b=60  apartamente cu 4 camere
a=70-60
a=10  apartamente cu 2 camere
V: 2x10+4x60=20+240=260 camere