Madeline uses this scale model of a design she plans to paint on a wall.
She uses the key 1 cm = 1.5 ft. One gallon of paint will cover 400 square
feet of wall.
How many gallons of paint will Madeline use?
Enter your answer as decimal in the box.
To find the total area of the design on the wall in square feet, we first need to find the area of the scale model in square centimeters.
Let's assume the area of the scale model is 100 square centimeters. Since the scale is 1 cm = 1.5 ft, the actual area on the wall would be 100 cm² * (1.5 ft / 1 cm)² = 225 ft².
If one gallon of paint covers 400 square feet, then Madeline would need 225 ft² / 400 ft²/gallon = 0.5625 gallons of paint.
Therefore, Madeline will use 0.5625 gallons of paint.