Photo egative

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

Correct answer:

a =  18.9 cm
b =  14.7 cm

Step-by-step explanation:

$$\begin{gathered} k=21\mathrm{/}4\mathrm{/}10={\displaystyle \frac{21}{40}}=0.525 \\ a=36\cdot k=36\cdot 0.525={\displaystyle \frac{189}{10}}\text{ cm}=18.9\text{ cm} \end{gathered}$$

$b=28\cdot k=28\cdot 0.525={\displaystyle \frac{147}{10}}\text{ cm}=14.7\text{ cm}$

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