Question

need exaplanation for tis question it's data sufficiency

Answer 1

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Answer 2

the perimeter is 120 
therefore  lengthwidth will be [120 - (20 ×2)]/2 =[120-40]/2=80/2=40 m
area = length × bredth=40×20=800m²

and also by using the triangle 
 there is two triangle 
area of one =1/2 × base ×height =1/2×120×40=1/2×800 = 400m²
there fore area of 2triangle is equal to 2 × area of triangle = 2× 400m² =800m²