What would the predicted TSS value of a solution be if I combined one liter of 35 mg/L solution with one liter of 114 mg/L solution? Thanks for the help.

What is TSS?

Whatever it is, I suspect the answer is
1000 mL x 35 mg/L = ? mg
1000 mL x 114 mg/L = ?mg
Then total mg/2 L = ?