Two speakers that are 15.0 m apart produce in-phase sound waves of frequency 240 hz in a room where the speed of sound is 340 m/s . a woman starts out at the midpoint between the two speakers. the room's walls and ceiling are covered with absorbers to eliminate reflections, and she listens with only one ear for best precision.

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it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =