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? Choose the most appropriate option:
A) 740  B) 228  C) 690  D) 780  E) 458

Rationale: "solution : sum of 1 st 12 results = 12 * 14 sum of last 12 results = 12 * 17 13 th result = x ( let ) now , 12 * 14 + 12 * 17 + x = 25 * 24 or , x = 228 . answer : option b"
Answer: B