Length breadth and height of room are in ratio 3:2:1. Breadth and height are halved and length is doubled. What is total area of four walls of a room?
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Ratio length:breadth:height=3:2:1
If breadth and height are halfed and length is doubled.
Then l:b:h=6:1:1/2(multiply by 2 )
Or 12:2:1
Let the length be 12x then breadth and height will be 2x and x respectively.
Area of 4 walls=2h(l+b)
=2*x(12x+2x)
=2x(14x)
=28x²
Finding area Before changing dimension of walls
Area of 4 walls before changing the l,b,h(3x,2x,1x)
area of 4 walls
=2h(l+b)
=2*x(2x+x)
=2x(2x+x)
=2x(3x)
=6x²
If breadth and height are halfed and length is doubled.
Then l:b:h=6:1:1/2(multiply by 2 )
Or 12:2:1
Let the length be 12x then breadth and height will be 2x and x respectively.
Area of 4 walls=2h(l+b)
=2*x(12x+2x)
=2x(14x)
=28x²
Finding area Before changing dimension of walls
Area of 4 walls before changing the l,b,h(3x,2x,1x)
area of 4 walls
=2h(l+b)
=2*x(2x+x)
=2x(2x+x)
=2x(3x)
=6x²
bojjarohit1997:
The options are given as 1) decrease by 18.5% 2)decrease by 30% and 3)decrease by 13.6% 4)decrease by 15%
now i can solve it let me edit
I guess formula is 2h(l+b)
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