If there were no significant interactions would be additive (using data from mass and volume), but there may be a considerable deviation, depending on the type of interaction.

1. for an ideal solution, as stated in the previous answer, the volumes of the liquids (assuming that the solvent and solutes A and B are liquid) are additive and, in that case (and only in that case), you can obtain an approximate value for density provided that the temperature at which the volumes of A and C were measured is the temperature at which density values were obtained;

In that case:

Therefore, a rough value for density is:  dsolution= Vm*M

Please see annex

thank you very much for both of Dr ruben and Dr ana i really appreciate the effort.

Best regards