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A series of books were published at seven years intervals when the seventh book was issued the sum of the publications years was 13524, when the first book was published?
a) 1911
b) 1800
c) 1900
d) 1811
Read Solution (Total 7)
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- the answer below is incorrect.the calculation gives answer as 1911
x+x+7+x+14+x+21+x+28+x+35+x+42=13524
7x+147=13524 then x=1911 - 11 years agoHelpfull: Yes(18) No(0)
- avg of 7 books= 13524/7= 1932
1932-3(7)=1911 (7+7+7)=for 3times before 4th book was published - 11 years agoHelpfull: Yes(4) No(1)
- Let x be the 1st book published year
so yrs : x,x+7,x+14,x+21,x+28,x+35,x+42
sum=13524
x+x+7+x+14+x+21+x+28+x+35+x+42=13524
7x+147=a3524 => 7x=13377
x=1900 - 11 years agoHelpfull: Yes(4) No(7)
- let x be the year it was published for the first time,
then
x+(x+7)+(x+14)+.....+(x+42)= 13524(this series on left is in A.P and it is for 7 editions as given)
therefore, x=1911 - 11 years agoHelpfull: Yes(2) No(0)
- sorry it is 1911
- 11 years agoHelpfull: Yes(2) No(1)
- a.1911
13524=3.5*(2*a)+42 - 11 years agoHelpfull: Yes(2) No(0)
- a) 1911
let x be the first year and add +7 each year till 7th book as their sum is equal to 13524. So,
x + x+7 + x+14 + x+21 + x+28 + x+35 + x+42 =13524
solve it you get x = 1911 - 6 years agoHelpfull: Yes(0) No(0)
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