Question

a box measures 70cmx36cmx12cm is to be covered with canvas how many meters of canvas of width 80cm would be required to cover 150 such boxes

Answer 1

Sur areaof 150 boxes = 150x2(70x36+36x12+70x12)
Req. Length= [150x2(70x36+36x12+70x12)] /80x100 m

Answer 2

First take total surface of a box
=2{(70x12)+(70x36)+(36x12)}
=2{840+2520+432}
=2 x 3792
=7584
Then 150 boxes are
=150 x 7584
=1137600
=1137600/80
=14220
14220 metre is total canvas needed