Mathematics, 01.04.2021 01:20 maribelmartine8919

The average age of 3 girls is (7years months The average age of 2 of them is 17 years 3 months
How old is the third girl.

please explain your answer.
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The average age of 3 girls is (7years months The average age of 2 of them is 17 years 3 months