Question

Length breadth and height of rumour 5 M 4 m and 3 M find the cost of whitewashing the walls of room and the ceiling at the rate of rupees 7.50 per metre square

Answer 1

Length=l=5
b=4
h=3
Area for whitewashing = CSA of cuboid (room) + Area of ceiling.
= 2 (l+b)h+l×b
=2 ( 5+4)3+(5×4)
=2 ×9×3+20
= 54+20
=74.

Rate= 7.50/square.m
Cost = Rate × Area
Cost = 7.5×74
Cost = Rs.555

Answer 2

area

wall l×b×h.5×4×3=60m2 .white washingof wall=60×7.50=rs.4500