Question

length of a room is increase 20% and wrigth is decrease 20% .By what area of a room is change.

Answer 1

Let the length of room = x
and the width of the = y
A.T.Q....
l = x+x*20/100
b = y-y*20/100
so the area of the room = l×b = (x+x*20/100)×(y-y*20/100) = (6x/5)(4y/5)
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