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ana+bogdan=7 mere
ana+calin=8 mere
ana+calin+bogdan=12 mere
câte mere are ana?


Anabogdan7 Mereanacalin8 Mereanacalinbogdan12 Merecâte Mere Are Ana class=

Răspuns :

1) 12-8=4(mere Bogdan)
2)7-4=3(mere Ana)
ana+calin=8mere=>ana+calin+bogdan=12 mere=>8+bogdan=12=>bogdan=4 mere
ana +bogdan=7 mere
ana+4=7=>ana=3 mere