Let the original amount be x.
After first shop:
Remaining money = x - 25
At second shop:
Spent half of remaining, so remaining = (1/2)(x - 25)

At third shop:
Spent one third of remaining, so remaining = (2/3) × (1/2)(x - 25) = (1/3)(x - 25)
After third shop, money left = $60:
(1/3)(x - 25) = 60
Multiply both sides by 3:
x - 25 = 180
Add 25 to both sides:
x = 205
Answer: The dealer originally had $205.