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A phone company offers two monthly plans. Plan A costs $11 plus an additional $0.19 for each minute of calls. Plan B costs $18 plus an additional $0.14 for each minute of calls. For what amount of calling do the two plans cost the same?

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chudung1976
We call x the minutes to talk
+ Plan A costs $11 plus an additional $0.19 for each minute of calls, so we have the money for x minutes: 11+0.19x
+ Plan B costs $18 plus an additional $0.14 for each minute of calls. So we have the money for x minutes: 18+0.14x

We have solve this equation: 11+0.19x = 18+0.14x
or 0.19x-0.14x=18-11
and 0.05x= 7 we have x=7:0.05= 140
For 140 minutes of calling do the two plans cost the same

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