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The GCF is 5.
7 is not the greatest common factor (GCF) of 15, 30, and 35 because 7 does not evenly divide into all three numbers. The GCF is the largest number that can divide all three numbers without leaving a remainder, and in this case, the GCF is actually 5 since 5 divides evenly into all three numbers.
The GCF of 5 and 8 is 1. The LCM is 40.
The GCF for those three numbers is.... 1 !
18, 27, 45