Nine days ago the area covered by the mould on a piece of bread was three square inches
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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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