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The average age of three people running for election is 42. A fourth person joins the race and the average drops to 40. What is the fourth person's age?​

User Anupama
by
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1 Answer

5 votes

Call the four people
abc and
d.

We know:


(a+b+c)/(3)
=42

and


(a+b+c+d)/(4)
=40

Thus:


a + b + c = 126


(126+4)/(4) = 40


126 + d =160


d = 34

User Tsu
by
8.6k points

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