Question

the cuboid shaped metal water tank with dimensions 3 m *1.5* m *
1 m the tank has no lead the colouring is at the rate of 20 rupees per square metre what is the cost needed to colour the three such tanks
from inside

Answer 1

TSA of cuboid =2(lb+bh+hl))
=2(3×1.5+1.5×1+3×1)
=2(4.5+1.5+3)
=2×9
=18m^2

cost of colouring 1tank =18×20
=360rs

cost of colouring 3tanks=360×3
=1080rs