Three ducks and four ducklings weogh 32 and four duck and three ducklomhs weigh 44 tyen two duck and one duckling can finish it in
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3D+2d=32 multiply by -4
4D+3d=44 multiply by 3 & add them
-12D-8d=-128
12D+9d=132
-------------------
d=4 kg. for each duckling.
3D+2*4=32
3D+8=32
3D=32-8
3D=24
D=24/3
D=8 kg. for each Duck.
Proof:
4*8+3*4=44
32+12=44
44=44
4D+3d=44 multiply by 3 & add them
-12D-8d=-128
12D+9d=132
-------------------
d=4 kg. for each duckling.
3D+2*4=32
3D+8=32
3D=32-8
3D=24
D=24/3
D=8 kg. for each Duck.
Proof:
4*8+3*4=44
32+12=44
44=44
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