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Asked in PPSC, FPSC and other one-paper exams (compiled from unofficial resources).

AlgebraLinear Equations

If $54$ is subtracted from $3$ times a certain number, the result is $36$. Find the number.

A.$30$Correct answer
B.$20$
C.$25$
D.$35$

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Quick fact: Let the number be $x$; then $3x - 54 = 36$, so $3x = 90$ and $x = \mathbf{30}$.

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