Question

o rata cantareste 2 kg.iar 6 gaini,4 rate si 3 curcani cantaresc impreuna 47 kg.cat cantareste fiecare pasare daca un cu curcan cantareste cat 2 rate si o gaina?

Answer 1

r=2
6g+4r+3c=47
c=2r+g
c=2×2+g
c=4+g
6g+4×2+3(4+g)=47
6g+8+12+3g=47
6g+3g=47-8-12
9g=27
g=27:9
g=3
c=4+g
c=4+3
c=7

Answer 2

o rata = 2 kg 

6 gaini ............4 rate ............3 curcani .........47 kg 

1 curcan = 2 rate + o gaina = o gaina + 4 kg

6 gaini .........3 x ( o gaina + 4 kg) ........47 kg - 4 x 2 kg → am inlocuit curcani

6 gaini .........3 gaini ............47 kg - 8 kg - 12 kg = 27 kg 
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9 gaini = 27 kg
 
27 : 9 = 3 kg cantareste o gaina 

3 kg + 4 kg = 7 kg cantareste un curcan