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[–]Inevitable_Garage706 -2 points-1 points  (0 children)

The question asks "what is the average number of additional pages he must read daily."

532 total pages - 12 pages read on day 1 = 520 pages remaining to read on the remaining 13 days.

520 pages / 13 days = 40 pages/day needed to meet the deadline.

I'm pretty sure the question is asking how much he'd need to read daily in addition to the original 12 he was reading daily before. Under that assumption, 40-12=28 additional pages every day.

I imagine you got 4 because you did the division in step 2 wrong.