Question

Lena purchased a prepaid phone card for $20. Long distance calls cost 21 cents a minute using this card. Lena used her card only once to make a long distance
call. If the remaining credit on her card is $12.23, how many minutes did her call last?

Answer 1

Answer:

Step-by-step explanation:

Since she used  $ 7.77

for her only call and since one call costs  $0.21 per minute, you you can compute number of minutes she spent for her last call.

How did we find $7.77:

$20-$12.23= $7.77

Now, $7.77 : $0.21= 37 minutes

Her call lasted 37 minutes