Mathematics: The average age 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?

The average age three people running for election

Ответ:

editsa

16.03.2022

Mathematics

Call the four people a, b, c

and

.

We know:
$\frac{a+b+c}{3}=42$

and
$\frac{a+b+c+d}{4}=40$

Thus:
a+b+c=126

$\frac{126+d}{4}=40$
126+d=160

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Ответ:

thibeauxkristy

27.04.2020

Mathematics

23456789

Step-by-step explanation:

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