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Răspuns :

Sper ca te-am ajutat!
g+r =40
g=10+r
10+r+r = 40
2r= 40-10=30
r=30÷2=15
g=10+15=25
15 rate
25 gaini
Vezi imaginea THEBOOKSLOVER
g, r =nr.găinilor, rațelor
g+r=40
g=r+10
r+10+r=40
2r=30
r=30÷2
r=15
g=15+10
g=25
V:g+r =25+15=40