The average of 25 results is 18. The average of first 12 of those is 14 and the average of last 12 is 17. What is the 13th result?
A. 74
B. 75
C. 69
D. 78
Answer: Option D
Solution(By Examveda Team)
Sum of 1st 12 results = 12 × 14Sum of last 12 results = 12 × 17
13th result = x (let)
Now,
12 × 14 + 12 × 17 + x = 25 × 18
Or, x = 78
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Comments ( 2 )
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Sum total of 25 results= 25×18=450
Sum of first 12 results= 12×14=168
Sum of last 12 results= 12×17=204
So, 13 th result =( 450- 372)= 78