The radius of a spherical balloon increases from 7 cm to 14 cm as air is being pumped into it. Find the (i) ratio of surface areas of the balloon in the two cases. (ii)ratio of volumes of the balloon in the two cases. #surfaceareaandvolumesclass10maths #surfaceareavolume #surfaceareaandvolumesclass10maths #mathsclass9 #maths #mensurationproblems #mensurationclass10 #mathsclass9 #maths #surfaceareavolume #mensuration