Question : If $3: x:: 12: 20$, then what is the value of $x$?
Option 1: 10
Option 2: 6
Option 3: 8
Option 4: 5
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Correct Answer: 5
Solution : Given: $3: x:: 12: 20$ ⇒ $\frac{3}{x}=\frac{12}{20}$ ⇒ $x=\frac{3\times 20}{12}$ $\therefore x=5$ Hence, the correct answer is 5.
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