A rectangular flower bed has a perimeter of 96m, and its length is twice its breadth. The flower bed is surrounded by a concrete path of witdth 40 cm and height 15 cm. Calculate the volume of concrete used for the path, giving your answer in meter cubic.

Answer 1

width --- w
length --- 3w

2(w+3w) = 96
4w = 48
w = 12 m or 1200 cm
3w = 36 m or 3600 cm

area of flower bed = 1200(3600) cm^2
area of rectangle including path
= (1280)(3680) cm^2
area of walkway = the difference or 390400 cm^2
volume of concrete needed for walk
= 390400(15) cm^3
= 5,856,000 cm^3
= appr 5.9 cubic metres

check my arithmetic