55. Solving a chemistry problem

172. When distributing succinic acid, taken in different quantities, between water and ether at 25ºС, the following data were obtained: the equilibrium concentrations of succinic acid in water (mol / l) are 5.98 * 10–2 and 4.67 * 10–2 , and in the air, respectively, 1.1*10–2 and 8.6*10–3. What is the concentration of succinic acid in an aqueous solution in equilibrium with an ether solution containing 7.5 * 10–3 mol / l of this acid at 25ºС.