The length, breadth and height of a room are in the ratio 7:3:1. If th – McqOptions

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1.	The length, breadth and height of a room are in the ratio 7:3:1. If the breadth and height are doubled while the length is halved, then by what percent the total area of the 4 walls of the room will be increased?
A.	85%
B.	90%
C.	75%
D.	80%
E.	Cannot be determined
Answer» C. 75%

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