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  • Real Numbers - LCM and HCF
  • There are three pieces of timber of lengths 42 m, 49 m an...
Multiple choice

There are three pieces of timber of lengths 42 m, 49 m and 63 m. These have to be divided into planks of the same length. The least possible number of planks is

  1. 5

  2. 11

  3. 13

  4. 8

  5. None of these

Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

LCM of 42, 49 and 63: 42 = 7 x 3 x 2 49 = 72 63 = 7 x 32 LCM = 72 x 32 x 2 = 882

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