Question

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

Answer 1

x = 21.3.

Explanation:

From the definition of an arithmetic mean:

(2.7 + x) / 2 = 12 Multiply through by 2:

2 .7 + x = 24

x = 24 - 2.7

x = 21.3.

Answer 2

x = 21.3

Explanation:

The average is calculated as

average =
`(score)/(count)`, that is

`(x+2.7)/(2)` = 12 ( multiply both sides by 2 )

x + 2.7 = 24 ( subtract 2.7 from both sides )

x = 21.3