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2 years ago

If the average (arithmetic mean) of 2, 7, and x is 12, what is the value of x?

Mathematics

1 answer:

stealth61 [152]2 years ago

6 0

Answer:

x = 27

Step-by-step explanation:

mean is calculated as

mean = $\frac{sum}{count}$

sum = 2 + 7 + x = 9 + x and count = 3 , then

$\frac{9+x}{3}$ = 12 ( multiply both sides by 3 to clear the fraction )

9 + x = 36 ( subtract 9 from both sides )

x = 27

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