Question

two metallic sphere of radius 9 cm and 10 cm are melted and recast to make new spheres. If the radius of one of new sphere is 12 cm then the radius of other new Sphere is ___________cm.

Please answer me fastly and correct.​

Answer 1

Answer:

let R=9cm,r=10cm and radius of first new sphere be x and that of second be y.

Step-by-step explanation:

4/3πR^3+4/3πr^3=4/3πx^3+4/3πy^3

4/3π(R^3+r^3)=4/3π(x^3+y^3)

R^3+r^3=x^3+y^3

9^3+10^3=12^3+y^3

729+1000=1728+y^3

1729=1728+y^3

1729-1728=y^3

1=y^3

1^3=y^3

y=1

thus radius of second new sphere is 1 cm

Answer 2

Answer:

hopefully it's helpful to you