Diane purchased a prepaid phone card for $20. Long distance calls cost 19 cents a minute using this card, Diane used her card only once to make a long distance call. If the remaining credit on her card is$17.34, how many minutes did her call last?

May 2, 2017

Exactly 14 minutes and zero seconds.

Explanation:

Since she used $2.66 for her only call and since one call costs $0.19 per minute, you can compute number of minutes she spent for her last (and only) call.

Let me start how we compute $2.66 first. $20-$17.34=$2.66

Now find duration of her call: ($2.66)/($0.19)=14 minutes.

I think it is a long call. Really long one indeed.
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