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.
Correct Answer: B
Solution :
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