Question $8,$ chap $117,$ sect $4.$ part $1$ of $110$ points

The sound of a man shouting at the top of his lungs from a rather large distance away from your ear has loudness of only $20$ decibels.

What would be the decibel level of four men shouting at the top of their $($equally powerful$)$ lungs from the same distance away from you ear? Assume that there is no interference from superposed waves.

${}_4=80dB$

${}_4=14dB$

${}_4=160dB$

${}_4=6dB$

${}_4=26dB$

${}_4=5dB$

${}_4=20dB$

${}_4=10dB$

${}_4=60dB$

${}_4=40dB$