If 18 inches is equal to 1 1/2 feet, how many feet long is a 36 inch board? A 72 inch board?

A 36 inch board would be multiplying 1 1/2 by 2 so it would be 3 foot. A 72 inch board would be multiplying 3 foot by 2 so it would be 6 ft

Since 36 is 18 times 2, you would need to multiply 11/2 by 2 which is 3 feet. Then 72 is 36 times 2, so you would need to multiply 3 by 2 which is 6. So: 18 inches = 1 1/2 feet

, 36 inches = 3 feet, and 72 inches = 3 feet.