The average age of eight teachers in a school is 40 years A teacher among them died at the age of 55...........

Quantitative Aptitude (CGL) Average

The average age of eight teachers in a school is 40 years. A teacher among them died at the age of 55 years whereas another teacher whose age was 39 years joins them. The average age of the teachers in the school now is (in years)-

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Explanation:

Suppose the ages of eight teachers are A1, A2,……..,A8;
A1+ A2+……..+A8 =40*8 = 320;
After a teacher dies and joins another-
A1+ A2+……..+A8 = 320 - 55 + 39 = 304;
The required average = 304/8 = 38 years;