Question

Biswas made a box 20 cm long, 15 cm & broad and 10cm high but without a lid. How much cardboard did he use for it

Answer 1

1000cm^2 is the answer

Answer 2

surface area of cuboid=2(15*10+10*20)+20*15
=2(150+200)+300
=2(350)+300
=700+300
=1000cmsquare