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Un elev are o suma de bani.In prima zi a cheltuit jumatate din suma,a doua zi o treime din rest,iar a treia zi restul de 20 de lei. Ce suma de bani a avut elevul? Cat a cheltuit in prima zi? Cat a cheltuit a doua zi? Va rog,trebuie urgenttttttttttttttttttttttttttttttttttttttttttttt!!!!!!!!!!!!!!!!!!!!!!!!!