Answer:
Gina works through 2 chapters in 8.5 days.
Explanation:
If Gina works through 0.25 of a chapter in her social studies book every day, then in 8.5 days she will have completed:
0.25 x 8.5 = 2.125 chapters
Since she can't complete a fraction of a chapter, we can round down to the nearest whole number to get the final answer. Therefore, Gina works through 2 chapters in 8.5 days.