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VA ROOOG!!!
Stefan are cu 30 de timbre mai multe decat Ion. Stiind ca impreuna au 210 timbre, aflati cate timbre are fiecare. multumesc!!!


Răspuns :

(210-30):2=180:2=90 timbre are Ion
90+30=120 timbre are Stefan

S=Stefan
I = Ion
S+I=210 timbre
S=I+30
acum inlocuiesti ....I+30+I=210
2I=210-30
2I=180
I =90 timbre inseamna ca S=90+30=120
verificare:90+120=210timbrr