a=nr. de probleme facut de Teodora
b=nr.de probleme facut de Denisa
c=nr. de probleme facut de Raluca
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Rezolvare:
a+b+c=36 probleme
a+b=22 probleme
b+c=24 probleme
c=36-22=>c=14 probleme
a=36-24=>a=12 probleme
b=36-(14+12)=>b=10 probleme