The average of the age of the first three children in a class is 13.5 years. If the sum of the ages of the first two children is 25 years, then what is the age of the third child?
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Answer:
15.5 years
Step-by-step explanation:
Let x be the age of third child.
then
We know that
average=sum of given numbers/total number
=>13.5=25+x/3
If we solve this we got answer 15.5 years
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