SOLUTION: The average of 4 children is 10.the ages of 3 are 10,12,8.What is the age of the 4th child?

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Question 701490: The average of 4 children is 10.the ages of 3 are 10,12,8.What is the age of the 4th child?
Answer by stanbon(75887) About Me  (Show Source):
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The average of 4 children is 10.the ages of 3 are 10,12,8.What is the age of the 4th child?
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average = sum of numbers/number of numbers
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Equation:
(x + 10 + 12 + 8)/4 = 10
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x + 30 = 40
x = 10 (age of the 4th child)
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Cheers,
Stan H.
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