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Two bear puzzle for students of 9th and 11

Hello friends,
This one is a puzzle question.There were two bears A and B having same mass m.But weight of A being higher than B.
Tell the colour of A and B.
....


Confused...
If two things have same mass but different weight then there must be difference in acceleration due to gravity.Now,due to oblate spheroidal shape of earth the radius of earth varies at poles and equator.The radius being smaller at poles,g will be higher since g=Gm/r2.Therefore the bear must be at North or south pole.Since polar bears are found in north pole,so the colour will be white.Hence A has white colour and B black.
Thanks...

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