They can be and are.
28, 35, 42, 49, 56
12, 24, 36, 49, 60, 72, 84 28, 56, 84
The factors are 1, 7 and 49. The multiples are 0, 49, 98, 147, 196 ... (just keep adding 49)
None in that range.
60 and the infinitely many multiples of 60.
The multiples of seven between 20 and 60 are: 21, 28, 35, 42, 49, 56.
They are: 42, 49 and 56
60 and 80
The multiples of 4, 5 and 8 that are between 49 and 95 are just these two: 60 and 80.
60, 90.
60, 90.
60 and 90.
60 and 90
28, 35, 42, 49, 56
The multiples of 7 between 40 and 60 are 42, 49, and 56.
Multiples 21: 1,3,7,21Multiples 49: 1,7,49
LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.