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Three pieces of timber 42 m, 49 m and 63 m long have to be divided into planks of the same length, What is the greatest possible length of each plank?

7 m
14 m
42 m
63 m

Correct Answer: 7 m

Explanation:

Greatest possible length of each plank = H.C.F of 42, 49, 63 = 7 m

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