Correct Answer: Option B
ধরা যাক ,
দৈর্ঘ্য= x
প্রস্থ = 2x-10
প্রশ্নমতে,
x(2x-10)= 600
2x2-10x-600 = 0
or, 2x2-30x+20x - 600=0
or,2x(x-30)+20(x-30)=0
or,(2x+20)(x-30)=0
or,x=30
দৈর্ঘ্য= 30
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