Question

La o cabana 100 de turisti ocupa 32 camere,unele cu cate 2 paturi altele cu cate 5 paturi.Cate camere de fiecare fel s-au ocupat?

Answer 1

a+b=32=>a=32-b

2a+5b=100
2(32-b)+5b=100
64-2b+5b=100
3b=100-64=>b=36:3=>b=12 camere cu 5 paturi

a=32-12=20 camere cu 2 paturi

Answer 2

a+b=32=>
=>a=32-b
2a+5b=100
2(32-b)+5b=100
64-2b+5b=100
3b=100-64=>b=36:3=>b=12 camere cu 5 paturi
a=32-12=20 camere cu 2 paturi