If 3 buckets containing 2kg of paint has been used to paint a fence 90 m long and 80 cm high. how many buckets of 2kg of paint are necesary to paint a fence 200 meters long and 120 cm high?

3 buckets covers 90m x 80cm = 3 buckets for 90x0.8 = 3 for 72

x buckets covers 200m x 120cm = x buckets for 200x1.2 = x for 240

3/72 = x/240

720 = 72x

x = 10 buckets of paint to cover 200mx120cm fence