The average age of the group having 3 members is 84 One more person joins the group and now the aver...........

Quantitative Aptitude ( CCS) Average

The average age of the group having 3 members is 84. One more person joins the group and now the average becomes 80. Now a fifth person comes whose age is 3 years more than that of fourth person replaces the first person. After this the average age of the group becomes 79. What is the weight of the first person?

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Explanation:

Solution:
Let the group of members are A, B, C, D, E
A+B+C = 84*3 = 252
A+B+C+D = 80*4 = 320
Then D = 320-252 = 68 and E = 68+3 = 71
Now B+C+D+E = 79*4 = 316
(A+B+C+D) – (B+C+D+E) = 320- 316
A-E = 4
Then A = 71+4=75.