Algebra math problem?
Yolanda purchased a prepaid phone card for $30 . Long distance calls cost 7 cents a minute using this card. Yolanda used her card only once to make a long distance call. If the remaining credit on her card is $29.23 , how many minutes did her call last?
I got 1min and 17 secs but it wants the answer in minutes!??
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first find out how much money she used up: $30 - $29.23 = $0.77
if it's 7 cents= 1 minute, 77 cents = ?
77/7 = 11 minutes
Yolanda's call cost her 73 cents. 73 cents divided by 7 cents a minute is 10 3/7 minutes.
11 minutes
30-29.23=0.77
0.77/.07=11