Two rulers

We have two rulers. Scale interval on first rulers are a spaced 1 cm and on second spaced 15 mm. Rulers are attached to each other so that they match initial divider commas. What next dividers commas coincide? Find at least three cases.


a =  30 mm
b =  60 mm
c =  90 mm


Solution in text a =
Solution in text b =
Solution in text c =

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