If 18 inches is equal to 1 1/2 feet, how many feet long is a 36 inch board? a 72 inch board? a 144 inch board?

18 inches=  1 1/2 feet= 1.5 feet

18 inches = 1.5 feet

(1) Now we make a proportion to find feet for given inches

1.5 * 36 = 18*x

54 = 18 x (Divide by 18 on both sides)

x = 3

3 feet long is a 36 inch board

(2) 72 inch board

1.5 * 72 = 18*x

108 = 18 x (Divide by 18 on both sides)

x = 6

6 feet long is a 72 inch board

(3) 144 inch board

1.5 * 144 = 18*x

216 = 18 x (Divide by 18 on both sides)

x = 12

12 feet long is a 144 inch board

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