A single-storey office building has floor dimensions of 40m × 30m and a height of 3m to a suspended acoustic tile ceilin

[answerhappygod]

A single-storey office building has floor dimensions of 40m ×
30m and a height of 3m to a suspended acoustic tile ceiling. The
average height of the ceiling void is 1.5 m. A plant room is
adjacent to the roof void. There is a common plant room wall of 10m
× 1.5m high in the roof void. The sound pressure level in the plant
room is expected to be 61 dB. The reverberation time of the roof
void is 0.6 s. The plant room wall adjoining the roof void has a
sound reduction index of 13 dB. Calculate the sound pressure level
that is produced within the roof void as the result of the plant
room noise. What would you suggest if you wish to further reduce
the sound pressure level from the plant room to the adjacent
rooms?