How to solve this 5year ago the average age of a,b,c,and d was 45.with e joining the average age of all the five is 49 years.how old is e?
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you have been given average of 4 people, 5 years ago. then, you can find the total of their ages 5 years ago as...
(a-5 + b-5 + c-5 + d-5) /4 = 45
a+b+c+d -20 = 45*4
i.e., a+b+c+d=160
presuming the the e joined at the current time, the eqn becomes
a+b+c+d+e / 5 = 49
e= 49*5 / (a+b+c+d)
e=85
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