Step 1: Set up the equations

Let the cost of one pencil be $x$ and the cost of one pen be $y$. According to the problem:

$3x + 5y = 101 \quad \text{--- (Equation 1)}$

Step 2: Set up the second equation

Using the second given statement:

$5x + 3y = 91 \quad \text{--- (Equation 2)}$

Step 3: Add both equations

Adding Equation 1 and Equation 2 gives:

$(3x + 5x) + (5y + 3y) = 101 + 91 \implies 8x + 8y = 192$

Step 4: Find the cost of 2 pencils and 2 pens

Divide both sides by 4 to get the combined cost of 2 pencils and 2 pens:

$2x + 2y = \frac{192}{4} = 48$