i hope you have already found the volume of the cylinder, the hemisphere and the cone in the previous question
taking the radius as 5cm, height of the cylinder as 5cm, and the perpendicular height of the cone also 5 cm..
you get the volume of the hemisphere as - 523.5987
the volume of the cylinder as - 392.699
the volume of the cone as - 130.899
as we are unaware of the mases..v take their volumes previously found out to get the ratio
first..relate the volume of the hemisphere, the cylinder and the cone to the volume of the cone as it is the least ...
the ratio of the volume of the hemisphere to the volume of the cone
i.e 523.5987/130.899 = 4
the ratio of the volume of the cylinder to the volume of the cone
i.e 392.699/130.899 = 3
the ratio of the volume of the cone to the volume of the cone is obviously 1
therefore the answer is 4:3:1
check the markscheme too...just check if the answer is corrcect