The number 7. 7 goes into 21 3 times; 7 goes into 49 7 times.
No, it cannot. Only these can: 1, 7, 49.
1 and 7.
No because it will have a remainder of 1
1 and 49
1, 7, 49.
1,2,4,8,11
Three: 1 7 49.
Three: 1 7 49.
Any of its factors
1 and 97.
3 will go into both of these numbers