Compound A and compound B can be applied as solvents for the extraction of an acid dissolved in water. The distribution coefficients of the acid in the two solvents at a temperature of 28C are: K1 = 0.095 (mass fraction of the acid in B/mass fraction of the acid in water) and K2 = 0.015 (mass fraction of the acid in A/mass fraction mass of the acid in water). Calculate the necessary amounts of the two solvents to reduce the acid content from 40% by weight to 20% by weight, taking 1000 kg of initial aqueous solution as the calculation base and indicate which of the solvents you would choose, explain your choice.