The average of 25 results is 24. The average of first 12 of those is 14 and the average of last 12 is 17. What is the 13th result?	Pick: A) 740 B) 228 C) 690 D) 780 E) 458
Solution: Sum of 1st 12 results = 12*14   Sum of last 12 results = 12*17   13th result = x (let)   Now,   12*14+12*17+x = 25*24   Or, x = 228.   Answer: Option 228
<result>B</result>
The average of 25 results is 24. The average of first 12 of those is 14 and the average of last 12 is 17. What is the 13th result?