Book Maths Puzzle

A certain number of persons can finish a piece of work in 100 days. If there were 10 persons less, it would take 10 more days finish the work. How many persons were there originally?

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Book Other Question

9 examiners can examine a certain number of answer books in 12 days by working 5 hours a day. How many hours in a day should 4 examiners work to examine twice the number of answer books in 30 days? 8 persons can build a wall 140m long in 42 days. In how many days can 30 persons complete a similar wall 100 m long?