Sagot :
tavuk=x
ördek=y
x=3y-120
x+y=2120
taraf tarafa topla
x-3y=120
x+y=2120
taraf tarafa toplarken - ile çarp
-x+3y=120
x+y=2120
şimdi taraf tarafa topla :D
4y=2240
y=560
560 ....................................................................................................................................
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