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Basically, when you add a +'ve constant to numerator and denominator of a +'ve fraction is gets larger, when you add a +'ve constant to numerator and denominator of a +'ve important fraction it gets smaller.
(1) m<n so m/n is a fraction, but we don't know if the constant is +'ve or negative so we don't know what adding it will do.
(2) X>0 so we know the constant is +'ve but we dont know if the fraction is proper or improper.
(1)+(2) we have a fraction and we add a +'ve constant to the numerator and denominator, therefore it gets bigger. suff.
Well, for proper fraction (when numerator is less than denominator), if we add any same constant number both in num & den, new fraction is greater than the original fraction. But if same number is subtracted, new faction is smaller than the original one. whereas in improper fractions (when numerator is greater than denominator), above conditions becomes exactly opposite.
So, to answer this ques, we need to know whether m>n and sign of x. Both these conditions are supplied by combining both the statements.