A number is doubled and 8 is added. If the resultant is trebled, it becomes 84. What is that number?	Options:
A) 10
B) 6
C) 8
D) none of these
E) can not be determined

Rationale: "solution let the number be x . then , 3 ( 2 x + 8 ) ‹ = › 84 ‹ = › 2 x + 8 = 28 ‹ = › 2 x = 20 x = 10 . answer a"
Answer: A