Irony

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In our life, math is always mysterious and useful... From ancient to contemporary period, math has assisted people to get through those unintelligible stuff. For instance, at the beginning of our history, people didn't have as much comprehension on universe as we do now. After philosophers' observation plus mathematics, those ideas gradually form as "Cosmology"... Math is associated with our life, everyday, we use it not only on business but also on our academy. In this case, we can see math problems everywhere nowadays, which means people need to learn math in order to have enough mathematical ability. At this point, math question sometimes confuse people... The question asks the student to find X, therefore, you should write a number for it instead of pointing the X out immediately. Ironically the student find where is X exactly... obviously, X is right over here...