A hall is 36 m long and 24 m broad allowing 40 square m for door and window the cost of papering the wall at ₹8.40 per square metre is ₹4704 find the length of hall
Answers
Answer:
hey dear ,
Given ,
hall length = 36 m
breadth = 24 m
given in attachment ‼️ .
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Answer:
Height = 5m
Step-by-step explanation:
I think there is a mistake in question , we have to find the height of hall instead of length.
Given---> A hall is 36m long and 24m broad allowing 40 m² for door and window the cost of papering the wall at rupees 8.40 per m² is rupees 4704
To find ---> Height of the hall.
Solution----> ATQ,
Cost of papering the wall per m² = Rupees 8.40
Total cost of papering = Rupees 4704
Now if we divide total cost of papering by cost of papering per m² , we get , area which is papered
ie area of walls minus area allowed for doors and windows .
Area to be papered = 4704 / 8.40
= 470400 / 840
= 560 m²
Let height of the hall be h .
Area of four walls = 2 ( l + b ) h
= 2 ( 36 + 24 ) h
= 2 ( 60 ) h
= 120 h m²
Area to be papered = Area of four walls - Area allowed for doors and walls
=> 560 = 120 h - 40
=>560 + 40 = 120 h
=> 600 = 120 h
=> h = 600 / 120
=> h = 5 m
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