Mathematics, 11.02.2020 21:40 SmokeyRN

10. Stefi mobiltelefon-költségeinek fedezésére feltöltőkártyát szokott vásárolni. A mobiltársasag ebben az esetben sem
előfizetési díjat, sem hívásonkénti kapcsolási díjat nem számol fel. Csúcsidőben a percdíj 25 forinttal drágább, mint
csúcsidon kivül. Stefi az elmúlt négy hétben összesen 2 órát telefonált és 4000 Ft-ot használt fel kártyája egyenlegebol
úgy, hogy ugyanannyi pénzt költött csúcsidőn belüli, mint csúcsidőn kívüli beszélgetésekre. Hány percet beszélt Stefi
mobiltelefonján csúcsidőben az elmúlt négy hétben?

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10. Stefi mobiltelefon-költségeinek fedezésére feltöltőkártyát szokott vásárolni. A mobiltársasag eb...

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