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Because 20 is at 0 and 30 at 9. Therefore 30-20=10 corresponds to 9.Thank you so much.
But what are these values written in the marking scheme? i dont really get those.From where did they get 28/29.
And when finding the value on the stage micrometer,why did you take it as 10 units,not 3mm?
And I myself don't understand the table in the mark scheme, heh. I only checked the final answer and it matched the one I got, so I guess the method I used is correct.