1.

and together have a mass of 7 kg while  and  together have a mass of 6 kg. Which option is correct?

A.   has a mass of 1 kg exactly.
B.   is 1 kg lighter than .
C.   and have a mass of 13 kg.
D.   is 1 kg greater than  z.
Answer» C.   and have a mass of 13 kg.


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