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Answer :
Given: We have 9cm as the lenght of the model for which 12 cm is the actual length.So, for 28 cm of actual length ,let x be the length of the model
We can see this is the case of direct proportion,So we have
\(\frac{9}{12}=\frac{x}{28}\)
\(\Rightarrow x=28\times \frac{9}{12}\)
\(\Rightarrow x=21 cm\)
Hence, the length of the model ship is 21 cm.