A rectangular garden bed measures 22 feet by 15 feet and it needs a walking border, so a 1 foot wide strip is added around all four sides. What is the total fencing length needed around the outer edge of the border?

Correct answer to question 234 (Arithmetic Reasoning): 82 feet

Method

Adding a 1 foot border on every side increases both dimensions by 2 feet, since the border adds to each end. The outer rectangle becomes 24 by 17 feet, and its perimeter is 2 x (24 + 17), or 82 feet.