Question : If $14 : 30 :: 7 : x$ , then what is the value of $x$ ?
Option 1: 15
Option 2: 21
Option 3: 9
Option 4: 12

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Question : If $2 x^{2} - 7 x + 5 = 0$ , then what is the value of $x^{2} + \frac{25}{4 x^{2}} ?$
Option 1: $5 \frac{1}{2}$
Option 2: $7 \frac{1}{4}$
Option 3: $9 \frac{1}{2}$
Option 4: $9 \frac{3}{4}$

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Answer 1

Correct Answer: 15

Solution : $14 : 30 :: 7 : x$
⇒ $\frac{14}{30} = \frac{7}{x}$
⇒ $x = \frac{7 \times 30}{14}$
⇒ $x = 15$
Hence, the correct answer is 15.

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Question : If 14:30::7:x, then what is the value of x?Option 1: 15Option 2: 21Option 3: 9Option 4: 12

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Question : If $14 : 30 :: 7 : x$ , then what is the value of $x$ ?
Option 1: 15
Option 2: 21
Option 3: 9
Option 4: 12