For the athlete:
[tex]1\text{ week }\rightarrow0.25\text{ kg of protein}[/tex]For 7 weeks, we multiply each side by 7:
[tex]\begin{gathered} 7\cdot1\text{ week }\rightarrow7\cdot0.25\text{ kg of protein} \\ \\ 7\text{ weeks }\rightarrow1.75\text{ kg of protein} \end{gathered}[/tex]Knowing that 1 kg = 1000 g, the answer is:
[tex]1750\text{ grams}[/tex]