Book Maths Puzzle

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?

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Book Other Question

The product of two 2 digit numbers is 2028 and their HCF is 13. What are the numbers ? What is the least number which when doubled will be exactly divisible by 12, 14, 18 and 22 ?