Eight persons with an average weight 49 kg were in a lift. Two more persons Anita and Kamal boarded the lift and the average weight of the persons in the lift increased by 2.8 kg. What is the average weight of Anita and Kamal?

63 kg

Total weight of 8 person = Average weight × Number of person

= 49 × 8

= 392 kg

Now, when Anita and Kamal board the lift, the average weight of the persons in the lift increases by 2.8 kg.

New average weight is = 49 + 2.8 = 51.8 kg

Total wight of 10 person = 10 × 51.8 = 518 kg

So, Weight of ANita and Kamal = 518 - 392 = 126 kg

Average weight of Anita and Kamal = \(\frac{126}{2}\) = 63 kg