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2 September, 12:27

Lena purchased a prepaid phone card for $20. Long distance calls cost 21 cents a minute using this card. Lena used her card only once to make a long distance

call. If the remaining credit on her card is $12.23, how many minutes did her call last?

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  1. 2 September, 14:01
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    Step-by-step explanation:

    Since she used $ 7.77

    for her only call and since one call costs $0.21 per minute, you you can compute number of minutes she spent for her last call.

    How did we find $7.77:

    $20-$12.23 = $7.77

    Now, $7.77 : $0.21 = 37 minutes

    Her call lasted 37 minutes
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