32. 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? (a) 64 years (b) 66 years (c) 61.5 years (d) 70 years
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Answer:
b) 66 years
Step-by-step explanation:
read this formula before reading my explaination it will help - sum of all things/total no of things , this formula is used for finding average .
so , the Average age of 5 people is 42 years which means that the total sum of the ages of all the 5 people is 210 we get this by multiplying 42 and 5.
the second group has 8 people with an average age of 81 yrs so which means that the total sum of their ages is 648 we get this by multiplying 81 and 8.
now since we know the sum of the ages of the people from both the groups
we can add them and divide them by 8+5 to get the averge age of all people
which is 858/13 which is 66.
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