66. Solving a chemistry problem

6. To determine the total content of Ca2 and Mg2 in the solution, 9.00 cm3 of 0.1120 mol/dm3 of a complexone III solution was used to titrate 10 cm3 of this solution with Eriochrome black T. To determine Ca2, 9.50 cm3 of 0.1120 mol solution of complexone III was added to 10.00 cm3 of the same solution, its excess was titrated in the presence of murexide with 6.09 cm3 of 0.1000 mol/dm3 of CaCl2 solution. Calculate the content of Ca2 and Mg2 in 100.0 cm3 of solution.