1, the weight of bucket b after pouring out 1/3 is regarded as the unit 1, and the weight of bucket b after pouring out 1/4 is 1+2/7 = 9/7, so the original bucket b is1+kloc.

So the corresponding score of 450kg is 3/2+ 12/7 = 45/ 14, so the unit of 1 is 450 ÷ 45/ 14 = 140kg.

So the original weight of barrel A is 12/7× 140 = 240 kg, and that of barrel B is 3/2× 140 = 2 10 kg.

2. Considering that the volume of two containers is 1, container A contains 1/4 salt and 3/4 water; Container b contains salt 1/5 and water 4/5. The volume ratio of salt and water after mixing is (1/4+1/5): (3/4+4/5) = 9/20: 31/20 =.