Răspuns :
Deci cam asa:
S+T=20
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S=9T
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9T+T=20
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10T=20
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T=2kg
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S=9*2=18
________
S+T=20
______
S=9T
____
9T+T=20
_______
10T=20
______
T=2kg
______
S=9*2=18
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