Well in this question we have to double the radius of the base of a cone, keeping the height the same, so we have to find the ratio between the volume of the larger cone to the smaller cone. This is a very important ncert maths mensuration chapter 13 question. I am getting answer right but my ratio is reciprocal i mean it is  4:1 but my answer is 1:4, where am i getting it wrong please help me.