What is 2/3 of 45? (Before you attack me saying "Try to do it yourself dont be lazy" im in 5th grade and this is a really hard subject for me so ye is did try it myself)

The perimeter of a rectangular lot of land is 436 ft. this includes an easement of x feet of uniform width inside the lot on which no building can be done. if the buildable area is 122 ft by 60 ft, determine the width of the easement. select one: a. 9 feet b. 18 feet c. 4.5 feet d. 7 feet