If the remainder obtained by subtracting a number from its own square is 6 times the number, what is the number?

a)4 b) 3 c) 6 d) 7

• This is a very simple question. Solution is as follows.
  Remainder obtained by subtracting the number from its own square is 6 times the number.
  That means X2 - X = 6 X
  X2 = 7 X.
  X = 7
  
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