The ratio of a room length, width and height is 5:4:2. if in a new room, the length is increased by 40% and the width by 25%,what will the volume of room change for the total area of the four walls of the room to stay the same as before ?
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Length (L) = 2*6 = 12
Breadth (B) = 4/2 = 2
Height (H) = 2/2 = 1
Total Area of Walls = 2(BH + LH) = 2*(2*1 + 12*1) = 2*(2+12) = 28
example % change in Area of four walls = (28 - 40)*100 /40 = - 30per decrease
Breadth (B) = 4/2 = 2
Height (H) = 2/2 = 1
Total Area of Walls = 2(BH + LH) = 2*(2*1 + 12*1) = 2*(2+12) = 28
example % change in Area of four walls = (28 - 40)*100 /40 = - 30per decrease
Answered by
2
30 per decrease.............
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