Question

A wall which is 3 m by 3meters takes up paint costing 900 rupees to cover what is the cost of painting the outside Wall of a circular building of diameter 10 meters which is 10 meter high

Answer 1

Answer:

Area of the wall =(3×3)m

=9m²

Cost of painting of wall =Rs. 900

:. 9m²=900

1m²= 100

therefore painting of 1m²require Rs.100.

Now, area of outer wall=2×pi×r×h

=2200/7m²

Since, the cost of painting 1m² is RS.100

then, cost of painting 2200/7m² = 2200/7×100

=220000/7

RS =28,571.42