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What will be the least number which when doubled will be exactly divisible by 12, 18, 21 and 30 ?
  • a)
    196
  • b)
    630
  • c)
    1260
  • d)
    2520
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
What will be the least number which when doubled will be exactly divis...
L.C.M. of 12, 18, 21 30                 2 | 12  -  18  -  21  -  30
                                         ----------------------------
= 2 x 3 x 2 x 3 x 7 x 5 = 1260.       3 |  6  -   9  -  21  -  15
                                         ----------------------------
Required number = (1260 � 2)            |  2  -   3  -   7  -   5

= 630.
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Most Upvoted Answer
What will be the least number which when doubled will be exactly divis...
Approach:

- First, we will find the LCM of the given numbers.
- Then, we will double the LCM to get the required number.

Calculation:

- LCM (12, 18, 21, 30) = 1260
- Double of LCM = 2 × 1260 = 2520

Therefore, the least number which when doubled will be exactly divisible by 12, 18, 21 and 30 is 2520.

Hence, option (d) is correct.
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What will be the least number which when doubled will be exactly divis...
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What will be the least number which when doubled will be exactly divisible by 12, 18, 21 and 30 ?a)196b)630c)1260d)2520Correct answer is option 'B'. Can you explain this answer?
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