Question

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

Answer 1

Hello!
As per conditions,
volume of a cuboid=l*b*h
So,
=5*4*3=60sq.m
.: cost of white washing the walls at the rate of 7.50rs.
=60*7.50=450rs.
Hope the answer is correct

Answer 2

Answer:

• Length of room = 5m
• Breadth of room = 4m
• Height of room = 3m

Area to be white-washed = Area of walls + Area of ceiling of room

$\\ \\ \tt \: = 2 \: lh \: + 2 \: bh \: + lb \\ \\ \\ \implies \tt \: (2 \times 5 \times 3 + 2 \times 4 \times 3 + 5 \times 4) \: \: {m}^{2} \\ \\ \\ \implies \tt \: (30 + 24 + 20) \: \: {m}^{2} \\ \\ \\ \implies \tt \blue{74 \: \: {m}^{2} }$

$\therefore\:\:$ Cost of white-washing 74 m² area = Rs. 7.50 × 20

= Rs. 555