Six people are standing in line for concert tickets. their average age is 27. the average age of the four people in line is 23. the average age of the last three people is 34. how old is the fourth person in line?

Total  number of years for the 6 pople = 27*6 = 162 years
total number of years for first  4 people = 4*23 = 92 years
total numbers of years for  last 3 = 102 years
total number of yeras for last 2 people = 162-92 = 70 years
age of 4th person in line = 102 - 70= 32