Answers

2014-02-24T20:24:56+05:30
Its very simple

small balloon's radius (r)=7cm
big balloon's Radius (R)=14 cm
so ,
the ratio= (4*pi*r^2)/(4*pi*R^2)
= r^2/R^2
= 7^2/14^2
= 49/196
= 1/4
= 1:4 ans

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2014-02-25T09:42:59+05:30
Total surface area of first spherical balloon=2 pi r²  =   2 pi 7*7
total surface area of second spherical balloon=2 pi r² = 2 pi 14*14
ratio of surface area=2 pi 7*7   
                             2 pi 14*14
that is 
         2*2
=1:4

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