Question

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Answer 1

Answer:

Your answer is 7

The least possible number of planks is 7 m. Step-by-step explanation: Given : If three pieces of timber 42 m, 49 m and 63 m long have to be dividend into planks of the same length.

Step-by-step explanation:

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Answer 2

Answer:

none of these

Step-by-step explanation:

• 42=7*6
• 49=7*7
• 63=7*9

The longest possible piece is 7 m (HCM of given lengths)

Then number of planks= 6+7+9= 22

Correct option is the last one: none of these