SOLUTION: The average of 25 numbers is 18. The average of first 12 numbers is 14 while that of last 12 is 17. What is the thirteenth number?
Options
- 78
- 87
- 92
- None of these
Algebra.Com
Question 980651: The average of 25 numbers is 18. The average of first 12 numbers is 14 while that of last 12 is 17. What is the thirteenth number?
Options
- 78
- 87
- 92
- None of these
Answer by josgarithmetic(39630) (Show Source): You can put this solution on YOUR website!
12*14+12*17, is twenty four numbers. Your question asks for a number as if it were arranged between these two groups of twelve.
The missing number is v.
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