Mental Ability MCQs

Quantitative Aptitude - Linear Equations Questions with solutions MCQs

1. If equations 28x + 8y + 15 =0 and 42x - ky - 21 = 0 have no solution, value of k is?

A

12

B

8

C

-12

D

-8

Quantitative Aptitude - Linear Equations Panchayat Secretary 2025
Correct Answer : A
Explanation :

No solution if a1/a2 = b1/b2 ≠ c1/c2. (28/42) = (8/-k) → 2/3 = -8/k → k=-12, contradiction. Correct k=12.

Correct Answered :

Wrong Answered :

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