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
[tex]\frac{feet}{inches} = \frac{feet}{inches}[/tex]
[tex]\frac{1.5}{18} = \frac{x}{36}[/tex]
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
[tex]\frac{1.5}{18} = \frac{x}{72}[/tex]
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
[tex]\frac{1.5}{18} = \frac{x}{144}[/tex]
1.5 * 144 = 18*x
216 = 18 x (Divide by 18 on both sides)
x = 12
12 feet long is a 144 inch board
