Final answer:
The total area of the three walls is 24 m², and for two coats, we need to cover 48 m². Since each can covers 10 m², we'll need 5 cans of paint.
Step-by-step explanation:
To calculate the total area of three walls that are each 4 meters long and 2 meters high, we multiply the length and height of one wall and then multiply by three, since there are three such walls:
Area of one wall = length × height = 4 m × 2 m = 8 m2
Total area of three walls = 8 m2 × 3 = 24 m2
To determine the number of paint cans required to give two coats to these three walls, we first find the total area to be painted:
Total area for two coats = 24 m2 × 2 = 48 m2
Since one can cover 10 m2, the number of cans needed = Total area for two coats / Area covered by one can
Number of cans = 48 m2 / 10 m2 per can = 4.8 cans
Since we can't purchase a fraction of a can, we'll need to round up to the nearest whole number. Therefore, we'll need 5 cans of paint to complete the job.