The common factors are: 1, 2, 3, 5, 6, 10, 15, 30.
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% rate: = (90/150) x 100% = 0.60 x 100% = 60%
It is: 30
greatest common factor of 66 90 and 150 is 6.
50-10=40. 40+60=100. 100-10=90. 90+60=150. I think we see the pattern. Next number is 150-10 or 140.
The GCF of 90 150 and 120 is 30. This leaves you with 3, 5 and 4. There are no further common factors between the 3 remaining numbers.