Joe has 1/3 as much money as Antwan. After Antwan gives $15 to Joe, he had 3/5 as much money as Joe. How much money did Joe have at first?
Let the amount of money that Antwan has==A
Then, Joe has ==1/3A
A - 15 ==3/5 * [1/3A + 15]
A - 15==1/5A + 9
A - 1/5A ==9 + 15
4/5A ==24
4A ==24 * 5 ==120
A ==120 / 4 ==$30 what Antwan started with
1/3 * 30 ==$10 what Joe started with
