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1 October, 13:00

Martina purchased a prepaid phone card for $20. long distance calls cost 13 cents a minute using this card. Martina used her card only once to make a long distance call. If the remaining credit on her card is 17.92, how many minutes did her call last?

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  1. 1 October, 13:53
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    The call lasted 16 mins, i used trial and error and the came across 16x. 13=2.08 and then you add 17.92 plus 2.08 and that gives you 20
  2. 1 October, 16:46
    0
    Phone card = $20

    You need to minus 17.92 from 20 = $2.08

    $2.08 / 0.13 = how many minutes

    = 16
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