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If a is the average (arithmetic mean) of j and 9, z is the average of 2j and 15, and c is the average of 3j and 18, what is the average of a, b, and z in terms of j?
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If a is the average (arithmetic mean) of j and 9, z is the average of 2j and 15, and c is the average of 3j and 18, what is the average of a, b, and z in terms of j?

User Torres
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because j equal q of r and w equal x of w
User Randall Hunt
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