Subtract 10:
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- 3u + 5u + 4u + 2 + 7 + 1 = 12u + 10
- \frac{12u + 10}{3} = 62
- 12u + 10 = 186
- 12u = 176
- u = \frac{176}{12} = \frac{44}{3}
- But $ u $ must be a real number consistent with the model, and since $ \frac{44}{3} $ is not an integer, recheck if the problem assumes integer counts. However, the question only asks for the value of $ u $ satisfying the average condition. So:
