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Quantitative Aptitude

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9 is added to...

Question

9 is added to a number after it is doubled. Three times the resultant is 75. What is that number?

A

3.5

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B

6

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C

8

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D

7

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E

4

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Solution

The correct option is C
8

Let the number be x. Then, \(3\left( {2x + 9} \right) = 75\,)

$\Leftrightarrow 2 x + 9 = 25 \Leftrightarrow 2 x = 16 \Leftrightarrow x = 8.$

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