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 ?
Algebra.Com
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)
.
3*10 = 30 total
.
2*10 =20 Total
.
1st two total + 3rd = 3 total
.
20 + 3rd = 30
.
3rd =10
.
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