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How do I find this answer?

How do I find this answer?-example-1

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~\hfill~ GHIJK \sim SWVUT~\hfill~ \\\\[-0.35em] ~\dotfill\\\\ \cfrac{ST}{GK}=\cfrac{SW}{GH}\implies \cfrac{ST}{3}=\cfrac{70}{7}\implies \cfrac{ST}{3}=10\implies ST=30 \\\\\\ \cfrac{JK}{TU}=\cfrac{GH}{SW}\implies \cfrac{JK}{30}=\cfrac{7}{70}\implies 70JK=210\implies JK=\cfrac{210}{70}\implies JK=3

User Rudresh Bhatt
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