Susan purchased a prepaid phone card for $15. Long distance calls cost 9 cents a minute using this card. Susan used her card only once to make a long distance call. If the remaining credit on her card is $12.03, how many minutes did her call last?

33 minutes

Step-by-step explanation:

We know that the initial amount of money on the card is $15 and that she had $12.03 after the call. We can subtract 12.03 from 15 to find out how much the call cost.

15 - 12.03 = 2.97

Now that we know the cost of the call is $2.97, we can divide it by the amount it cost per minute (9 cents) for Susan to make an international call:

First, convert $2.97 to cents:

$2 is the same as 200 cents.

200 + 97 = 297

Now, take 297 and divide it by 9:

297/9 = 33

The call lasted 33 minutes.