Question

a painter needs 3 days to paint the walls of a room. How long would it take working at a same rate, to paint a room twice as long, twice as wide and twice as high​

Answer 1

Answer:

12 days because the walls would be four times as big as the first room.

Step-by-step explanation:

If the walls are 10 ft x 10 ft, then each wall has 100 square feet. Adding the four walls makes 400 square feet to paint. Doubling the width and height of the walls to 20 ft x 20 ft means each wall is now 400 square feet, for a total of 1600 square feet to paint. 1600 ft is four times 400 square feet, thus if it took him 3 days to paint 400 square feet, it will take 12 days (or four times as much) to paint 1600 square feet.