Titration paper

Can someone help me answer this? I have been racking my brains all weekend trying to even understand the wording is so difficult! Would be so very appreciated!

Determination of calcium and magnesium.
The following results were obtained from the practical:
Analysis for Ca & Mg Volume / mL
First titration 30.
Second titration 30.2
Analysis for Ca alone
First titration 20.8
Second titration 20.65
1. The concentrations of the two EDTA solutions were 0.0496M and 0.0098M
For the sample of seawater used, calculate the individual concentrations of Ca and
Mg in the sample in g L-1
. All steps in the calculations must be shown and explained
with text in third person and past tense.
[55 marks]
2. A full (300 words 10%) discussion section must comment on the final values,
comparing them to the literature (suitably referenced) and explain any differences
between your calculated value and the ones found in the literature.
[45 marks]

I'm doing the same and think ive done the first question, but no clue what the second one is asking for ahhhh