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Answer: 2/3 square inch each day
Solution:
The mould covered 3 square inches 9 days ago.
The current area covered by the mould is = 9 square inches.
The difference in the mould coverage area is = 9-3=6 square inches.
In 9 days, a 6 equitable inch growth happened.
The growth rate in mould’s site is now defined as Change in the area occupied / time taken.
the Rate of Change = 6/9 = 2/3
The area of mould changes at a pace of 2/3 square inches each day.
