Question

A body weighs 10 kg at the equator but on the pole is

Answer 1

10 kg only because mass do not change

Answer 2

Mass of the body at the equator = 10 kg.

∴ Mass of the body at poles = 10 kg.

Mass is the quantity of the matter present, It never changes. It is independent of the place and any physical conditions. Therefore, It will never change on the Poles. It will remains same in each and every part of the earth. Also, on different planets too it remains same. 

Only weight of the substances change since it depends upon the gravitational force of the attraction.