Two (2.3333) times.
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3, 7, 21, 49
The divisors of 147 are 1, 3, 7, 21, 49, and 147.These do: 1, 3, 7, 21, 49, 147.
The number 7. 7 goes into 21 3 times; 7 goes into 49 7 times.
1, 2, 3, 6, 7, 14, 21, 42 1, 7, 49
LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.