Help pls explain how you got the answer

You will need a string of lights that are 66 feet long.

To put a string of lights around the garage this value will be equal to the perimeter.

Recall a rectangle has four sides.

The length of the garage is 22 feet.

The width of the garage is 1/2 that value, so the width of the garage is 11 feet.

To find the perimeter of the garage we can take 22•2=44 feet because there are 2 sides at a length of 22 feet long giving us 44 feet total.

The width of the garage is 11 feet, and there are two sides that are 11 feet long, giving us 22 feet for those two sides.

44+22=66 feet total for the perimeter

Or you can use the formula,
P=2L+2W,
P=2(22)+2(11)
P=66 :)