Asked by Anonymous

Charlotte read 10 pages of a storybook on the first day. She read 15 pages of the same storybook on the second day, 20 pages on the third day and so on. How many pages had the storybook if Charlotte finished it on the eight day?
Answered by Anonymous
pages on day n = 10 + 5(n-1)
google the words:

arithmetic sequence math is fun

look for sum of sequence terms one through eight
Answered by PsyDAG
If she can do it, each day increases by 5.

10 + 15 + 20 + 25 + 30 + 35 + 40 + 45 = ?
Answered by Anonymous
I guess the problem should have asked for terms 1 through 999 :)
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