SOLUTION: A series of 7 books are published at 9 – year intervals. When the 7th book was published, the sum of the publication years was 13601. In what year was the 5th book published?
(a
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Question 289868: A series of 7 books are published at 9 – year intervals. When the 7th book was published, the sum of the publication years was 13601. In what year was the 5th book published?
(a)1907 (b) 1970 (c) 1934 (d) 1943 (e) None of the above
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
7*1900=13300
13601-13300=301
301/9=33 4/9
9*33=297
301-297=4
7*x+7*9+6*9+5*9+4*9*3*9+2*9+9
7*9+6*9+5*9+4*9*3*9+2*9+9
(7+6+5+4+3+2+1)*9
28*9+7x=301
x=7
1907
1916
1925
1934
1943
answer 1943 for 5th
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