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Answer:
m = 8.
Step-by-step explanation:
Arithmetic mean 18 = (12 + 3m)/2
Cross multiply:
12 + 3m = 36
3m = 36 - 12 = 24
m = 24/3 = 8.
Check this answer:
(3(8) + 12)/2
= (24 + 12)/2
= 36/2
= 18.