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Question

If $X + Y = 2Z$ and $Z + W = 2X$, then:

This question was previously asked in
SSC CGL 2025 Tier 1 Question Paper (25-Sep-2025) (Shift 3)
The correct answer is
$X + Z = Y + W$

Analyzing the Algebraic Equations

We are given two equations:

  • Equation 1: $X + Y = 2Z$
  • Equation 2: $Z + W = 2X$

Our goal is to find a relationship between $X, Y, Z,$ and $W$ that must be true based on these equations.

Deriving Relationships Between Variables

First, let's isolate $Y$ from Equation 1:

$Y = 2Z - X$

Next, let's isolate $W$ from Equation 2:

$W = 2X - Z$

Testing the Relationship $X + Z = Y + W$

Now, let's see if the relationship presented in Option 1, $X + Z = Y + W$, is consistent with our derived expressions for $Y$ and $W$.

Consider the right side of Option 1: $Y + W$.

Substitute the expressions we found:

$Y + W = (2Z - X) + (2X - Z)$

Combine the terms:

  • Combine the $Z$ terms: $2Z - Z = Z$
  • Combine the $X$ terms: $-X + 2X = X$

So, $Y + W = Z + X$.

This means $X + Z = Y + W$.

Conclusion

The relationship $X + Z = Y + W$ is a direct consequence of the initial equations. This matches Option 1.

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