Robin had 4 times as much money as Shawn at first. After spending some money, Robin realized that Shawn had twice as much as he had. If Robin had $48 at first, how much did Robin have in the end?
Let Robin have $x in the end.
After spending some money,
Shown have = $2x
At first,
Robin have = 4 * 2x = 8x
According to given condition,
8x = 48
x = 48/8 = 6
x = $6
So, Robin have $6 in the end.
+36 
