A solid metal cylinder of 10 cm height and 14 cm diameter is melted and re-cast into two cones in the proportion of 3 : 4 (volume), keeping the height 10 cm. What would be the percentage change in the flat surface area before and after? @#pstet2016math #tgtmat#math mcq #meansuration#patwarimathmeansuration #volumeandarea mcqmath