A school is getting repainted. The painters arrive with 73 gallons of paint, and they will use 2 gallons to paint each classroom. After the painters finish painting all the classrooms, they will have 37 gallons of paint left. How many classrooms are there? Write and solve an equation to find the answer.
classrooms

___18___ classrooms

Step-by-step explanation:

Let the number of classrooms be x.

Each classroom uses 2 gallons, so x classrooms use 2x gallons.

They paint x classrooms using 2x gallons.

They still have 37 gallons left, so the entire amount of paint they had before they started painting was

2x + 37.

We are told they started with 73 gallons, so 2x + 37 must equal 73.

The equation is

2x + 37 = 73

Now we solve the equation.

Subtract 37 from both sides.

2x = 36

Divide both sides by 2.

x = 18

___18___ classrooms

answer:

c. the third graph