nine days ago the area covered by the mold on a piece of bread
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Is nice there is no mold present in it after that due to the moist and gases present in air it had been effected due to mold this is the cause of mold formation.
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The area covered by the mold nine days ago= 3 square inches.
The area covered by the mold in the present time= 9 square inches.
The change in area covered by mold is = 9-3=6 square inches
6 square inches change occurred in 9 days.
Now, The rate of change in mold’s area is Change in area covered / time taken.
The rate of change = 6/9
= 2/3
The rate of change in mold’s area is 2/3 square inches per day.
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