Book Maths Puzzle

What is the least number which when doubled will be exactly divisible by 12, 14, 18 and 22 ?

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Book Other Question

What is the greatest possible length which can be used to measure exactly the lengths 8 m, 4 m 20 cm and 12 m 20 cm? The least number which should be added to 28523 so that the sum is exactly divisible by 3, 5, 7 and 8 is