Question : If $2:9::4:x$, then the value of $x$ is:
Option 1: 42
Option 2: 18
Option 3: 36
Option 4: 22
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Correct Answer: 18
Solution : Given: $2:9::4:x$ $⇒\frac{2}{9}=\frac{4}{x}$ $⇒2x=36$ $⇒x=\frac{36}{2}$ $\therefore x=18$ Hence, the correct answer is 18.
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