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A series of books was published at 10years intervals when the 10th book was issued the sum of publication years was 19,560 when was the 1st book published

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Let's denote the publication year of the first book by x. Then the publication year of the second book is x + 10, the publication year of the third book is x + 20, and so on.

Since the sum of publication years of all ten books is 19,560, we can write the equation:

  • x + (x + 10) + (x + 20) + ... + (x + 90) = 19560

Simplifying this equation, we get:

  • 10x + (10 + 20 + ... + 90) = 19560
  • 10x + 450 = 19560
  • 10x = 19110
  • x = 1911

Therefore, the first book was published in 1911.

User HenryJack
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