Could someone please help me on the last 3 please it's algebra I'm Confused

If 25% of y is 30, what is 60% of y?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

The equatorial radius of earth is approximately 6 × 10^3 km, while the equatorial radius of saturn is approximately 6 × 10^4 km. which of the following is true? a. the equatorial radius of saturn is approximately one hundred times that of earth. b. the equatorial radius of saturn is approximately ten times that of earth. c. the equatorial radius of earth is approximately one hundred times that of saturn. d. the equatorial radius of earth is approximately ten times that of saturn.