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Sum of n Terms

If 8 : 9 is...

Question

If $8 : 9$ is equal to $456 : x$ , then the value of $x$ is

A

350

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B

450

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C

600

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D

513

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Solution

The correct option is D $513$
$\frac{456}{x} = \frac{8}{9}$
On cross multiplying, we get
$x = \frac{9 \times 456}{8}$
$∴ x = 513$

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f (x) = \sqrt{x^{2} + 6 x + 9} - \sqrt{x^{2} - 6 x + 9}

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, then the value of

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\frac{x}{y}

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, then the value of

(\frac{6}{7} + \frac{y - x}{y + x})

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