Calculated 81804

Mr. Hovorka pays a monthly flat rate of CZK 100 plus CZK 0.90 for each started minute of the 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?

Correct 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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