Answer:
20.
Step-by-step explanation:
We found the factors and prime factorization of 80 and 100. The biggest common factor number is the GCF number. So the greatest common factor 80 and 100 is 20
20
The factors of 80 are : 1, 2, 4, 5, 8, 10, 16, 20, 40, 80
The factors of 100 are : 1, 2, 4, 5, 10, 20, 25, 50, 100
The common factors are : 1, 2, 4, 5, 10, 20
The greatest common factor is 20
46
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5x+3x=12+4
8x=16
x=16÷8
x=2
