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Mixtures and weighted averages
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5-point ladder

Mixtures and weighted averages, 5-point ladder

●●●5 points, difficulty 3 of 35 pt

Needs an idea, not just a procedure.

3 in a row to finish this ladder.

0/1 solved

KA-0112

about 105s

A class of 12 scored an average of 8. Another class of 18 scored an average of 13. What is the average for all 30 students together?