SOLUTION: The average of the first 3 numbers in a certain series is 10. if the average of the first 2 numbers is 10. what is the third number ?
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Question 201843: The average of the first 3 numbers in a certain series is 10. if the average of the first 2 numbers is 10. what is the third number ? Answer by RAY100(1637) (Show Source):
You can put this solution on YOUR website! use ANT( avg * # = Total)
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3*10 = 30 total
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2*10 =20 Total
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1st two total + 3rd = 3 total
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20 + 3rd = 30
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3rd =10
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