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 .

Answer 1

The reduced bill is $12 dessert removed from the original bill: b - 12.
The amount of the tip is 20% of the reduced bill, which is $15: (b - 12) * 20/100 = 15.
Multiplying both sides of the equation by 100/20 we have: (b - 12) * 5 = 75.
Simplifying the left side of the equation gives: 5b - 60 = 75.
Adding 60 to both sides of the equation gives: 5b = 135.
Dividing both sides of the equation by 5 gives: b = 27.
The amount of the original bill is $<<27=27>>27. Answer: \boxed{27}.