Question

three solid spheres of radius 3 cm, 4 cm and 5 cm are melted and recasted into a solid sphere. what will be the percentage decrease in the surface area?

Answer 1

The total volume of the three spheres is:

 

(4/3)π(3)3 + (4/3)π(4)3 + (4/3)π(5)3

 

= (4/3)π(33+43+53)

 

= (4/3)π(216)

 

= (4/3)π(6)3

 

The "new" sphere would have radius = 6 cm

Answer 2

❤❤Here is your answer ✌ ✌

$\huge {\red {\bold {Answer}}}$

Total volume of three sphere is:-

4/3π(3)3 +4/3π(4)3+ 4/3π(5)3

4/3π{27+64+125}

4/3π{216}

4/3π×216

4π×72

288π