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

AlgebraLinear Equations

A certain two-digit number is three times the sum of its digits. If 45 is added to the number, the digits are reversed. The number is:

A.$27$Correct answer
B.$36$
C.$18$
D.$54$

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Quick fact: The two-digit number satisfying both conditions is $27$.

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