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Use the formula Strain=Extension/original length and rearrange to give Original length=Extension/Strain. Substitute the values you have for the strain and the extended length into the equation and voila! Source: Doing A-level (senior high-school in America) Maths and Physics.
You cannot.
By dividing length times width into its given volume
That will depend on the information given as for example if you are given its width and area then in order to find its length divide the width into the area.
The answer will depend on what other information is given.