The architect creates a new drawing with a scale of one grid unit equal to 1/2 foot. What is the length of the base of the bridge in the new drawing?

20 ft

Step-by-step explanation:

If you count how many unit’s there is on the picture then multiply by 2, you get 20

x is variable or an unknown value to find

example:

2x = 5 which means x = 3

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.