I have often defaulted to saying that if one can solve the problem then thats all that matters however math is exciting and I know there is an algebraic solution to this problem and I really want to experience it.

Desired:
1000 kg of milk testing 210 IU of vitamin A and 44 IU of vitamin D per 100 Ml

On Hand:

Vitamin A-D premix , 1 ml provides 175,000 IU of vitamin A and 37,000 IU of vitamin D

Specific gravity of premix is 0.971

Somehow I believe I will be crushed to see how simple this solution is.

Thanks for your time and help.