The average weight of 12 apples is 0.5 kg. If 3 watermelons are added in the bag (in which the apples are kept) then the calculated average weight increases by 0.5 kg. What is the weight of 3 watermelons?

The average weight of 12 apples is 0.5 kg. If 3 watermelons are added in the bag (in which the apples are kept) then the calculated average weight increases by 0.5 kg. What is the weight of 3 watermelons?
1). 6
2). 10
3). 9
4). 14

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