Raina purchased a prepaid phone card for $25...

Question

Raina purchased a prepaid phone card for $25. Long distance calls cost 9 cents a minute using this card. Raina used her card only once to make a long distance call. If the remaining credit on her card is $22.03, how many minutes did her call last?

Answer 1

Let x = # of unknown minutes used up

 

To total upwards to the $25.00:  0.09x + 22.03 = 25

 Subtract 22.03 from both sides to get:

 

0.09x = 2.97

 

Divide both sides by 0.09

 

We get the number of minutes, x = 33

 

To test this:  0.09 * 33 + 22.03 = 25     [Check]