The average 18

The average age of 5 members of a committee is the same as it was 3 years ago. Because an old member has been replaced by a new. Find the difference between the ages of old and new member.

Correct answer:

d =  12

Step-by-step explanation:

5 a = 4 (a+3)+b 5a = 4a+12+b a = b+12  ba = 12 d = ba  d=12



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