Avg. amt. of annual interest earned across 3 investment acct's was 2709. If 1 accn't yielded 1345 in a 12 month period, and 2nd yielded 568, what did 3rd accn't yield?

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First (A + B + C)/3 = 2709

so

(1345 + 568 + x)/3 = 2709

1345 + 568 + x = 3*2709

1913 + x = 8127

x = 8127 - 1913

x = 6214

Check - (1345 + 568 + 6214)/3 = 8127/3 = 2709

So the answer is 6214.

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