To solve this problem, we need to determine the value of x, which represents the length of each spool of wire in feet.
Let's break down the information given:
Number of spools of wire: 3
Length of each spool of wire: x feet
Length of wire needed to make a necklace: 4 feet
Number of necklaces that can be made: 15
We can set up the equation as follows:
Number of spools of wire * Length of each spool of wire = Length of wire needed to make all necklaces
3 * x = 4 * 15
Let's simplify and solve for x:
3x = 60
To isolate x, we divide both sides of the equation by 3:
3x / 3 = 60 / 3
x = 20
The value of x is 20.
#### 20
The answer is: 20
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
John buys 3 spools of wire that are x feet each.  It takes 4 feet to make a necklace. He can make 15 necklaces.

### Answer:
