To solve this problem, we need to set up a system of equations based on the information provided about the ingredients and their contributions of protein, carbohydrates, and fat.

Let:

• $x$ = units of Ingredient A,
• $y$ = units of Ingredient B,
• $z$ = units of Ingredient C.

From the problem, we know the following contributions for each ingredient per unit:

The target is to create a meal that has:

• 25 grams of protein,
• 35 grams of carbohydrates,
• 13 grams of fat.

We can now write the system of equations based on these totals:

1. For protein: $3x + 2y + 4z = 25$
2. For carbohydrates: $3x + 4y + 5z = 35$
3. For fat: $x + 2y + z = 13$

This system can be solved using substitution or elimination. Let's solve it step by step.

Step 1: Solve for one variable from the third equation

From the fat equation, we have: $x + 2y + z = 13$ Solve for $x$: $x = 13 - 2y - z$

Step 2: Substitute into the other two equations

Now, substitute $x = 13 - 2y - z$ into the protein and carbohydrates equations:

For protein: $3(13 - 2y - z) + 2y + 4z = 25$ [ 39 - 6y -