by constance
(tallahassee)
Elsa purchased a phone card for $25. Long distance cost .11 a minute using this card. Elsa used her card only once to make a long distance call. If the remaining credit on her card is $21.59, how many minutes did her call last.
Solution
Elsa spent 25 minus 21.59
25 - 21.59 = 3.41
Let y be the amount of minutes
0.11 × y = 3.41
Divide both sides by 0.11
0.11y / 0.11 = 3.41 / 0.11
y = 31
Her call lasted 31 minutes.
May 18, 21 06:54 AM
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