The average of 25 results is 18 The average of first 12 of those is 14 and the average of last...........

Quantitative Aptitude ( CCS) Average

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 ?

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*18
Or, x = 78

Submit Error