Question

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

Answer 1

apply the formula 2(l+b)h and find the area of four walls .multiplying the area with 7.50 and you will get the answer.

Answer 2

Question ::-

The length, breadth and height of a room are 5m, 4m and 3m respectively. find the cost of white washing the walls if the room and the ceiling at the rate ₹7.50 per ${m}^{2}$

Given ::-

• Length = 5m

• Breadth = 4m

• Height = 3m

To find ::-

• cost of white washing the walls if the room and the ceiling at the rate ₹7.50 per m ?

Solution ::-

It can observed that four walls and the ceiling of the room are to be white washed.

Total area to be white washed

= Area of walls + Area of ceiling of room

= 2lh + 2bh + lb

= [2×5×3+2×4×3+5×4]

= [30+24+20]

= 74

Hence , area = 74 ${m}^{2}$

__________

Cost of wash per ${m}^{2}$ = Rs. 7.50

Cost of wash 74${m}^{2}$ = Rs.(74×7.50)

⠀⠀⠀⠀⠀⠀⠀⠀= Rs. 555

Cost of whitewashing = Rs. 555