Question

intr-un bloc sun apartamente de 2 si 4 camere.in total sunt 222 afla cate apartemente sunt de 2 camere si de 4 camere​

Answer 1

Răspuns:

a+b=90=>a=90-b

2a+4b=222

2(90-b)+4b=222

180-2b+4b=222

2b=222-180=>b=42:2=>b=21 ap. cu 4 camere

a=90-21=>a=69 ap. cu 2 camere

verificare:

2·69+4·21=138+84=222 camere