Hello, we greatly appreciate all the comments.
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Regarding Variable approach, please find the attached. Once you know the number of variable and equations from the question, the probability of correct answer is 59%-80% even without substituting condition 1 and condition 2. As one member above said, yes, 20%-31% of cases have different answers from answers suggested from Variable approach, so Variable approach is recommended to use when you don't have enough to solve the question, because you still have 59-80% of getting your answers correct. If you go through our core theory of DS through Trial Pack, you will get to know how it works. Yes, we have a 7-day money back guarantee.
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