Actually, if you want a uniform bromide addition, then the halide solution added to the pot along with silver should be 0.0367 moles and the total volume should be identical to the volume of part B. If you want a combined bromo-iodide addition, then the total moles of halide should be 0.0367 and either the iodide should go into the kettle, or it should be mixed with the bromide being added with the silver, or it can be added 50/50 in the kettle and the salt solution as long as the total salt used in all parts remains at 0.0672 and total iodide remains at 2% and the total moles of halide being added with the silver is 0.0367 with a volume equal to part B.

Does that make sense to you?

Oh, BTW, since the MWs of AgNO3 and KI are almost identical, you can divide the weight of KI / wt AgNO3 and come up with almost the exact iodide content. Hope this hint helps too. It is close enough for starting calculations and often good enough for final work.