Shara borrowed money from her brother 6 months ago. She returned $10 per month to her brother. Currently, she was able to return half of the money she borrowed. How much will she still owe her brother 4 months from now?
For 6 months, Shara was able to return $10 x 6 = $<<10*6=60>>60 to her brother.
Since she already returned half of the money, then this means she currently owes her brother $<<60=60>>60.
Four months from now, she will be able to pay an additional $10 x 4 = $<<10*4=40>>40.
Thus, she will still owe her brother $60 - $40 = $<<60-40=20>>20 four months from now.
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