A number is as much greater than 50 as it is lesser than 84. What is the number?

Correct option is A

Let the number be n. The statement “a number is as much greater than 50 as it is lesser than 84” can be written mathematically as:
n - 50 = 84 - n
n+n = 84+50 
  2n = 134 
  n = 67.