Answer:
$636
Explanation:
864/5=172.80 so he paid 172.80 dollars for the phone bill. He then has 691.20 dollars left. he then gives his mother $55.20 and is left with $636.
$117.60
Do this:
$864 1 $864
_____ x ____ = ______
1 5 5
Then divide $864 by 5
Then take $172.80 - $55.20
That will give you your answer.
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