To solve this problem, we need to determine the value of x, which represents the initial amount of meat Jackson had in kilograms.
Let's break down the information given:
Amount of meat used for meatballs: 1/4x
Amount of meat used for spring rolls: 3 kilograms
Amount of meat left: 12 kilograms
We can set up the equation as follows:
Amount of meat used for meatballs + Amount of meat used for spring rolls + Amount of meat left = Initial amount of meat
1/4x + 3 + 12 = x
Let's simplify and solve for x:
1/4x + 15 = x
To isolate x, we subtract 1/4x from both sides of the equation:
1/4x - 1/4x + 15 = x - 1/4x
15 = 3/4x
To solve for x, we multiply both sides of the equation by 4/3:
15 * (4/3) = (3/4x) * (4/3)
20 = x
The value of x is 20.
#### 20
The answer is: 20
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Jackson had x kilograms of meat. He used 1/4 of the meat to make meatballs and used 3 kilograms of meat to make spring rolls. There are 12 kilograms of meat left.

### Answer:
