Charu's phone company charges 35 cents each minute of use during peak hours and 15 cents each minute of use during non-peak hours. If Charu's phone company charged her $7.90 for a half hour phone call, what is the greatest number of minutes charged at peak hour rates?

7

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13

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15

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17

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21

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Solution

The correct option is D $17$
Let the number of Minutes of peak hours be $x$
and remaining non-minutes minutes be $y$

So, $x + y = 30 0.35 x + 0.15 y = 7.90$

Solving above two equations we get
$x = 17, y = 13$

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Charu's phone company charges 35 cents each minute of use during peak hours and 15 cents each minute of use during non-peak hours. If Charu's phone company charged her $7.90 for a half hour phone call, what is the greatest number of minutes charged at peak hour rates?

The correct option is D 17Let the number of Minutes of peak hours be xand remaining non-minutes minutes be ySo, x+y=300.35x+0.15y=7.90Solving above two equations we getx=17,y=13

The correct option is D $17$
Let the number of Minutes of peak hours be $x$
and remaining non-minutes minutes be $y$

So, $x + y = 30 0.35 x + 0.15 y = 7.90$

Solving above two equations we get
$x = 17, y = 13$