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answer is option b
L.S.A of the room=2h(l+b)
2×6(7.5+6.5)=2×6×14=168m*2
IF YOU LEAVE 8M*2 FOR DOORS,168-8=160.
160=l×b
l=160÷2.5dm=160÷25÷100=160×4=640
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