The length,breadth,and height of a room are 5m,4m and 3m respectively.find the cost of white washing the walls of the room and the ceiling at the rate of Rs.7.50 per sq.m
Answers
Given:
Length of the room= 5m
The breadth of the room= is 4m
Height of the room= 3m
To Find
Cost of whitewashing the walls of the room and the ceiling at the rate of Rs.7.50/ m²
Solution:
Since the four walls and ceiling is to be whitewashed, so it has 5 faces excluding the base
Hence, the total surface area to be whitewashed= Lateral surface area + area of the ceiling
= 2(l+ b)h + (l× b)
= 2( 5+ 4)×3 + (3×4) m²
= 74 m²
Cost of whitewashing= Rs.7.50/m²
Cost of whitewashing the walls of the room and the ceiling= total area to be whitewashed × cost of whitewashing
= 74 m² × Rs.7.50/m²
= Rs.555
Thus, the cost of whitewashing the walls and ceiling of the room is Rs.555.
Answer:
555 Rupees
Step-by-step explanation:
Length =5m
Breadth =4m
Height =3m
Area of room =2(l×b)+2(b×h)+(l×b)
=2(5×3)+2(4×3)+(5×4)
=2×15+2×12+20
=30+24+20
= 74m²
Cost of White washing wall in 1m²=7.50 rupees