Find the greatest common factor of 210 and 90

The greatest common factor of 210 and 90 is 30

To solve this we first need to list all of the copies that they have with each other and multiply them.

210: 23 57

90: 2335

GCF: 23 5

Now that we found our GCF we need to multiply them together

2 ✖️3✖️5 = 30

Therefore 30 is the correct answer

Hope this helps! :3

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.