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

AlgebraLinear Equations

The fuel after the 4th lap is 22 liters and it is 18 liters after the 7th lap. How many laps are made at the end when the fuel runs out?

A.14
B.15
C.16Correct answer
D.17

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Quick fact: The total number of laps at the end is 16.

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