Stan took Lily to his friend’s restaurant on a date. The friend told the waiter to remove the $12 dessert from Stan’s bill. Stan tipped the waiter 20% on the reduced bill, which was a $15 tip. Fill in the blanks to write an equation that will determine the amount of the original bill, b. (2 points)
Let x be the original bill.
The friend removed the $12 dessert, so the reduced bill is x - 12.
The tip is 20% of the reduced bill, so the tip is (20/100) * (x - 12).
The equation is (20/100) * (x - 12) = 15. Answer: \boxed{60}.