There are two lots for sale . Lot A is 18 meters long and 12 meters wide while lot B is 19 meters long and 11 meters wide. Which lot will require a longer barbed wire to fence it?

To find the length of barbed wire required to fence a lot, we need to calculate the perimeter of the lot.

For Lot A:
Perimeter = 2 × (Length + Width)
= 2 × (18 + 12)
= 2 × 30
= 60 meters

For Lot B:
Perimeter = 2 × (Length + Width)
= 2 × (19 + 11)
= 2 × 30
= 60 meters

Therefore, both Lot A and Lot B require the same length of barbed wire, which is 60 meters.