I don't know what to do with this question, please help!
A piece of string 10m long is cut into pieces, so that the lengths of the pieces form an arithmetic sequence.
(i) The lengths of the longest and shortes pieces are 1m and 25cm respectively; how many pieces are there?
Answer:16
(ii) If the same string had been cut into 20 pieces with lengths that formed an arithmetic sequence, and if the length of the second longest had been 92.5 cm, how long would the shortest piece have been?
(ii) Is the one I don't know what to do with. I have already completed (i)

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which one !?

I need help with the last question please.

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