She reads 15.5 pages every 30 minutes. There are two 30 minutes in one hour (60 minutes) so the answer is 15.5*2 = 31.
Step 1: Find out how mnay pages she reads in an hour. 15.5 ~ 0.5 hour (2)15.5 ~ (2) 0.5 hour 31 ~ 1 hour
Answer: d) 31 pages per hour
Maria reads 15.5 pages in half an hour, which means she reads 31 pages in one hour. The calculation is done by multiplying 15.5 by 2. Therefore, the answer is D. 31 pages per hour.
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