Solution

ATQ, Step 1: Start with the given output value, which is 3. Step 2: Use the variable 'x' to represent the unknown value. Step 3: From Step 1, we know that 3 is equivalent to 100%. Step 4: Similarly, we can determine that 'x' represents 25% of the value. Step 5: This leads us to two simple equations: Equation 1: 12 equals 100% Equation 2: 'x' equals 25% Step 6: To solve for 'x', we divide equation 1 by equation 2, considering that both equations have the same unit (%).  Thus, we obtain: 12/x = 100%/25% Step 7: By taking the reciprocal of both sides of the equation obtained in Step 6, we have: x/12 = 25/100 ⇒ x = 3