This is how I went about: Question: If m>0 and n>0, is (m+x)/(n+x) > m/n 1) m<n 2) x>0 Before I jumped in I made solved the question. Since I know m and n both are +ve, so I can cross multiply m and n in the question. So, the question becomes, Is (m+x)/(n+x)> m/n? Is n(m+x)>m(n+x) ? Is nm + nx > mn ...

Apart from practicing, I would recommend reading editorial columns from online English newspapers at your leisure, since your first language wasn't English. This might help a long way specially in understanding CR questions and avoid reading it more than 2 times to figure out what it means.