Question

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

Answer 1

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.