Adam started reading a book of 300 pages from Sunday, and finished all the pages on the following Friday. After the first day, on each of the following days, he read 5 more pages than the previous day. At least how many pages did he read on Sunday?
(A) 24
(B) 30
(C) 36
(D) 37
(E) 38
Solution (Posted on Dec 19th):
Ans: E
a, a+ 5 a + 10, a + 15 a + 20, a+ 25 = 300
6a + 75 = 300
6a = 225
a = 225/6 = 37, so a should be 38 so that he finishes by Friday.
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