Book Maths Puzzle

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?

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Book Other Question

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? A rope can make 70 rounds of the circumference of a cylinder whose radius of the base is 14cm. how many times can it go round a cylinder having radius 20 cm?