Three pieces of timber, 42-m, 49-m and 63-m long, have to be divided into plank
same length. What is the greatest possible length of each plank?
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√8 + √32 + √2 - √200
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The lengths of three pieces of timber are 42m, 49m and 63m respectively.
We have to divide the timber into equal length of planks.
∴ Greatest possible length of each plank = HCF (42, 49, 63) Prime factorization: 42 = 2 × 3 × 7 49 = 7 × 7 63 = 3 × 3 × 7
∴HCF = Product of the smallest power of each common prime factor involved in the numbers = 7
Hence, the greatest possible length of each plank is 7m.
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