A rectangular nursery bed 10m long and 60m wide is edge on all four sides with a carpet grass step 4m wide. Find the area covered by carpet grass?

1 answer

just subtract the bed size from the bed+grass area:

(10+8)(60+8) - 10*60 = _____ m^2

extra credit: what would the width of the border have to be to make the grass and the bed have the same area?