Kerrie uses this scale model of a design she plans to paint on a wall. She
uses the key 1 cm = 0.5 ft. One gallon of paint will cover 400 square feet of
wall.
How many gallons of paint will Kerrie use?
Enter your answer as decimal in the box.
To find out how many gallons of paint Kerrie will use, we need to calculate the area of the wall in square feet and then divide that by the coverage of one gallon of paint.
First, we need to determine the dimensions of the wall based on the scale model. Let's say the length of the wall on the scale model is 8 cm and the width is 6 cm.
Converting the dimensions to feet using the scale key:
Length = 8 cm x 0.5 ft/cm = 4 ft
Width = 6 cm x 0.5 ft/cm = 3 ft
Now, we calculate the area of the wall:
Area = Length x Width
Area = 4 ft x 3 ft
Area = 12 square feet
Now, we divide the total area of the wall by the coverage of one gallon of paint:
Gallons of paint = Area of wall / Coverage per gallon
Gallons of paint = 12 sq ft / 400 sq ft/gallon
Gallons of paint = 0.03 gallons
Therefore, Kerrie will use 0.03 gallons of paint.