Mobile phone minutes

Mr. Hovorka pays a monthly flat rate of CZK 100 plus CZK 0.90 for each minute (or part thereof) of a call for his mobile phone. He calculated that each minute of the call last month cost him CZK 2.15. How many minutes was he on the phone?

Final Answer:

t =  80 min

Step-by-step explanation:

100+0.90 t=2.15 t  1.25t=100  t=1.25100=80  t=80=80 min



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