qaqpuk14
qaqpuk14
09.06.2020 • 
Mathematics

There are Horseback Riding Lessons. Last year, the 8 kids in a beginner's horseback-riding group were 7, 9, and 10 years old. The mode of the ages was 10, and the mean was 9. There were equal numbers of 7-year-olds and 9-year-olds. This year the group has stayed together. How many are there of 11 years old?

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