1. The average weight of A, B and C is 50 kg. If the average weight of A and B be 63 kg and that of B and C be 48 kg, then the weight of B is:
2. The average monthly income of P and Q is 3030. The average monthly income of Q and R is 4350 and the average monthly income P and R is 3500. The monthly income of P is:
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