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

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

A 2

B 4

C 6

D 8

Solution

Correct Answer: Option D

Let the number be v. Then, 3 (2x + 9) = 75.

2x + 9 = 25

=> 2x = 16

=> x = 8