SOLUTION: Karen purchased a prepaid phone card for $15. long distance calls cost 14 cents per minute using this card. Karen used her card only once to make a long distance call. Ifthe remain

Algebra ->  Linear-equations -> SOLUTION: Karen purchased a prepaid phone card for $15. long distance calls cost 14 cents per minute using this card. Karen used her card only once to make a long distance call. Ifthe remain      Log On


   



Question 341472: Karen purchased a prepaid phone card for $15. long distance calls cost 14 cents per minute using this card. Karen used her card only once to make a long distance call. Ifthe remaing credt on her card is $12.34, how many minutes did her last call last?
Found 2 solutions by edjones, josmiceli:
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
Let x be time that the call lasted.
15-.14x=12.34
-.14x=-2.66
x=2.66/.14
x=19 min.
.
Ed

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let t = minutes for her last call.
She used up 15+-++12.4+=+2.6 of the $15
.14t+=+2.6
t+=+2.6%2F.14
t+=+18.57 min