the volume of a wall ,5 times as high as it is broad and 8 times as long as it is high,is 12.8 metre cube find the breadth of wall

 Let The Breadth Be x m

Then Height = 5x

Length = 8*5x = 40x

Volume = Length*Breadth*Height

=> 40x*5x*x = 12.8

=> 200x³ = 12.8

=> x³ = 0.064

=> x = 0.4 m

x = 0.4*100 = 40cm