On the Dragon Boat Festival, the canteen bought two baskets of duck eggs, and the number of duck eggs in the second basket was only 3/7 of that in the first basket. Take thirty-nine duck eggs from the first basket and put them in the second basket. At this time, the number of duck eggs in the second basket is only 4/5 of that in the first basket. How many duck eggs are there in the second basket?

3/7÷( 1+3/7)=3/ 10

4/5÷( 1+4/5)=4/9

39 ÷ (4/9-3/ 10) = 270 (piece)

Basket B original duck eggs: 270× 3/ 10 = 8 1 (pieces)