Question

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

Answer 1

Step-by-step explanation:

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Question :-

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

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Given :-

• l = 5m
• b = 4m
• h = 3m
• the ceiling at the rate of ₹7.50 per metre square

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to find :-

• .find the cost of white washing the Wall of the room .

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solution :-

= 2 × ( l + b ) × h + l × b

= 2 × ( 5 + 4 ) × 3 +5 × 4

= 2 × 9 × 3 + 20

= 54 + 20

= 74

cost of white washing 1m = rs 7.5

Hence cost of 74m = 7.5 × 74 = rs555

Answer 2

Answer:

Rs.555

Step-by-step explanation:

Given :-

l = 5m

b = 4m

h = 3m

Ceiling at the rate of per sq. m = Rs. 7.50

To find :- Cost of white washing of the walls of the room.

Solution :-

= 2(l + b) h × h + l × b

= 2(5+4)3 × 3 + 5 × 4

= 2 × 9 × 3 + 20

= 74

Cost for 1sq. m = Rs.7.50

Cost for 74sq. m = Rs. 7.50 × 74 = 555.0 or Rs. 555