You need at least two numbers to find a GCF.
It is: 81
30 + 30 + 30 + 30 + 30 + 30 = 180
30
30
We don't know what operation you want. 1 x 30 = 30 0 + 30 = 30 60 - 30 = 30 900/30 = 30
30/1 = 30
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30
9 out of 30 = 30%
30
30 + 30 = 60
30 of them.