Question

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?

Answer 1

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.