The LCM is 210.
For 105, 84, 70, 49 the LCM is: 2,940
The LCM is: 210210
The LCM is: 210
The LCM is: 1,050.
1050
The answer is pretty simple. It is 105.I figured it out by doing this:15: 15, 30, 45, 60, 75, 90, 10535: 35, 70, 105
LCM(42, 70, 105) = 210
The LCM is 630.
GCF: 7 LCM: 210
2940
The GCF is 5.