Average age of 5 people is 42 years.Another group has 8 people who have average age of 81 years.When both groups are mixed what is average age of all people?64 years66 years61.5 years70 years
Question
Average age of 5 people is 42 years.Another group has 8 people who have average age of 81 years.When both groups are mixed what is average age of all people?64 years66 years61.5 years70 years
Solution
To find the average age of all people when both groups are mixed, you need to:
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Find the total age of people in each group.
- For the first group: 5 people * 42 years/person = 210 years
- For the second group: 8 people * 81 years/person = 648 years
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Add the total ages together: 210 years + 648 years = 858 years
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Add the number of people in both groups: 5 people + 8 people = 13 people
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Divide the total age by the total number of people: 858 years / 13 people = 66 years
So, the average age of all people when both groups are mixed is 66 years.
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