A number is doubled and 9 is added. If the resultant is

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A number is doubled and 9 is added. If the resultant is trebled, it becomes 75. What is that number ?

1. 6
2. 3.5
3. 8
4. None of these

Correct Option: C

Suppose number is x.
∴ 3 (2x + 9) = 75
⇒ 6x + 27 = 75
⇒ 6x = 48 ⇒ x = 8