Question

Citi purcei si cite curci sint intr-o gospodarie ,daca in total au :a)33 de capete si 82 picioare:

Answer 1

a=numar curci
b=numar porci
2a+4b=82
a+b=33/×2=>2a+2b=66
scadem relatiile: 2a+4b-2a-2b=16=>2b=16/:2=>b=8 porci
33-8=25 (a) curci

Answer 2

p+c=33. / ×2
4p+2c=82
2p+2c=66
4p+2c=82 scadem prima relatie din a 2a
(4p-2p)+(2c-2c)=82-66
2p=16. p=16:2. p =8

8+c=33. c=33-8. c=25