Question

A one-celled organism measures 32 millimeters in length in a photograph. If the photo has been enlarged by a factor of 100, what is the actual length of the organism?

Answer 1

The answer is 0.32 millimeters - move the decimal point over the amount of zeroes.
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Answer 2

Let x mm be the original size of the cell.

After enlarging by 100 times, the cell length becomes 100.x

Or 100x = 32 mm, then x= 32/100 →and x = 0.32 mm which the original size