Question

three sphere of diameter 2,3,4 cms respectively formed into single sphere. Find the diameter if new sphere assuming that volume of sphere is proportional to its cube of diameter

Answer 1

2×22/7*×2×2×22/7×3+2×22/7×4

88/7+132/7+176/7

396/7=2πr

396/7×7/44=r

r=9

OR

2+3+4=9