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?

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?

asked Jan 13, 2019 118k views

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