Question

The length, breadth and height of a room are 20m, 6m and 2m respectively. What is the cost of painting its four walls at the rate of Rs. 60 per square metre?

Answer 1

Step-by-step explanation:

2(lb+bh+hl)-lb

2(20×6+6×2+2×20)-20×6

2(120+12+40)-120

2(172)-120

2(50)

100×Rs.square metre

100×60

6000

Answer 2

The length, breadth and height of a room are 20m, 6m and 2m respectively. The cost of painting its four walls at the rate of Rs. 60 per square metre is 6240 Rs.

Step-by-step explanation:

The length of room = 20m

The breadth of room = 6 m

and height of a room= 2m

The area of four walls of the room = 2h(l+b)

= 2 (2) [20 + 6]

= 4[26]

= 104 sq. m.

If the  rate of Rs. 60 per square metre.

The cost of painting its four walls at the rate of Rs. 60 per square metre

= 60  × 104

= 6240 Rs

So, the cost of painting its four walls at the rate of Rs. 60 per square metre is 6240 Rs.