question_answer

The perimeter of rectangular piece of paper is 84 units. If the length is six times its width, what is its length?

A)  \[6\,cm\]                     

B)  \[18\,cm\]

C)  \[36\,cm\]       

D)  \[42\,cm\]

Correct Answer: C

Solution :

(c): \[2x(x+6x)=14x=84\Rightarrow x=6\] \[\therefore \,\,6x=36\,cm\]