Photo egative

Negative dimensions are 36mm and 28mm. What will be the photo size in the 21:4 ratio?

Correct result:

a =  18.9 cm
b =  14.7 cm

Solution:

k=21/4/10=2140=0.525 a=36⋅ k=36⋅ 0.525=18910=18.9 cm
b=28⋅ k=28⋅ 0.525=14710=14.7 cm

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