Negative and postcard

The image on the negative has dimensions of 36x24 mm and is enlarged to a postcard format of 13.5x9 cm. In what proportion have the lengths increased? In what proportion has the image content increased?

Correct result:

k =  15:4
q =  225:16

Solution:

$q=k\cdot k=3.75\cdot 3.75={\displaystyle \frac{225}{16}}=14.0625=225:16$

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