What is the least number which when doubled will be exactly divisible by 12, 14, 18 and 22 ?
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LCM (least common multiple) of 12 14 18 22
2 l 12 14 18 22
2 l 6 7 9 1 1
3 l 3 7 9 1 1
3 l 1 7 3 1 1
1 1 l 1 7 1 1 1
7 l 1 7 1 1
-------------------
1 1 1 1
LCM-> 2 × 2 × 3 × 3 × 11 × 7 = 2772
1386×2 = 2772
required number = 1386
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2 l 12 14 18 22
2 l 6 7 9 1 1
3 l 3 7 9 1 1
3 l 1 7 3 1 1
1 1 l 1 7 1 1 1
7 l 1 7 1 1
-------------------
1 1 1 1
LCM-> 2 × 2 × 3 × 3 × 11 × 7 = 2772
1386×2 = 2772
required number = 1386
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