7x 6y 4z 122 4x 5y 3z 88 9x 2y z 78 ........

Quantitative Aptitude ( CCS) Quadratic Equations

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7x + 6y + 4z = 122

4x + 5y + 3z = 88

9x + 2y + z = 78

X < Y = Z

X ≤ Y < Z

X < Y > Z

X = Y = Z or relation cannot be established

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Explanation:

Answer & Explanation
X < Y = Z
Explanation:
7x + 6y + 4z = 122 —(1)
4x + 5y + 3z = 88 —(2)
9x + 2y + z = 78 —(3)
From (1) and (2) => 5x – 2y =4 —(a)
From (2) and (3) => 23x + y = 146 —(b)
From (a) and (b) => x = 6, y = 8. Put values in eqn (3) => z = 8