Question

a hall is 25m long 20 metre broad and 5 M height find the cost of painting its four walls and its ceiling at rupees 10 per square metre

Answer 1

Answer:

Step-by-step explanation:

Length=25m

Breadth=20m

Height=5m

Area to be white washed=2 (l+b)×h

=2(25+20)×5

=2×45×5

=450 m Sq

Cost=450×10

=4500 Rs

Answer 2

Since the hall is cuboid shaped, it's surface area of its walls and ceiling will be 2(lb + bh + lh) - lb
2(25x20 + 20x5 + 25x5) - 25x20
2(500 + 100 + 125) - 500
2(725) - 500
1450 - 500
950 sq. m
Cost of painting 1 sq. m = 10
Cost of painting 950 sq. m = 950x 10
9500 rupees