Answer:
6
Step-by-step explanation:
Factors of 18 : 1 , 2 , 3, 6 , 9
Factors of 24 : 1 , 2 , 3 , 4 , 6 , 8 , 12
6 is the biggest factor that goes into both 18 and 24
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idk
48 is Bill's number hope i helped