Question

The average of 12, 17, 19 and x is 25. Find x.

Answer 1

Answer:

x = 52

Step-by-step explanation:

Formula

$\dfrac{\text{12+17+19+x}}{4} = \text{25}$

Combine the left

$\dfrac{\text{48+x}}{4} = \text{25}$

Multiply both sides by 4

4*(48 + x)/4 = 25 * 4

48 + x = 100                    Subtract 48 from both sides

48 - 48 +x = 100 - 48      Combine

x = 52