17. Four mark exercise problems X

A strip of $4 \ cm$ wide is cut and removed from all the sides of the rectangular cardboard with dimensions $30 \ cm \times 20 \ cm$. Find the area of the removed portion and area of the remaining cardboard.

 

Answer:

 

Area of the removed portion $=$  $cm^2$

 

Area of the remaining cardboard $=$  $cm^2$