A number is doubled and 15 is added. If resultant is trebled, it becomes 75. What is that number Choices
A) 8	B) 10	C) 5	D) 14	E) 7

Rationale: "explanation : = > 3 ( 2 x + 15 ) = 75 = > 2 x + 15 = 25 = > x = 5 option c"
Answer: C