Question

Three pieces of iron of uniform thickness and mass m and m and 2m

Answer 1

then what is your question

Answer 2

total mass =(m+m+2m)

                  = 4m

average mass =(4m/3)

                         = m(m/3)

∴The average mass of the balls are m whole of m/3

∴ The ratio of the mass is= m:m:2m

                                           =1:1:2

I hope it helps you.