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150 kg ; sister.
Step-by-step explanation:
Total weight of all family members is the sum of weights of father, mother, brother, Reenu and sister.
Total weight = weight of father + weight of mother + weight of brother + weight of Reenu + weight of sister.
⇒ Total weight = 53 kg + 47 kg + 23 kg + 18 kg + 9 kg
⇒ Total weight = 150 kg
Weight of Reenu is 18 kg.
Half of weight of Reenu is ( 18 kg / 2 ) or 9 kg.
In the family, weight of sister is 9 kg. Therefore, sister's weight is half of the Reenu's weight.
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