The length, breadth and height of a room are 5 m, 4 m and 3 m respecti

1.	The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of Rs. 7.50 m2.
Answer» (i) Here we are given that length (l) = 5 m, breadth (b) = 4 m and height (h) = 3 m Total area of four walls and ceiling which is to be white washed = 2(l + b) x h + lb = [2(5 + 4) x 3 + 5 x 4] m² = (54 + 20) m² = 74 m² (ii) Cost of white washing 1 m² area = Rs. 7.50 Cost of white washing 74 m² area = Rs. (74 x 7.50) = Rs. 555

The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of Rs. 7.50 m2.

Answer»

(i) Here we are given that length (l) = 5 m,

breadth (b) = 4 m and height (h) = 3 m

Total area of four walls and ceiling which is to be white washed

= 2(l + b) x h + lb

= [2(5 + 4) x 3 + 5 x 4] m²

= (54 + 20) m² = 74 m²

(ii) Cost of white washing 1 m² area

= Rs. 7.50

Cost of white washing 74 m² area

= Rs. (74 x 7.50) = Rs. 555