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

Basic Arithmetic & Number SystemsAverage

The average of 6 numbers is $30$. If the average of the first four is $25$ and that of the last three is $35$, the fourth number is:

A.$25$Correct answer
B.$30$
C.$35$
D.$40$

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Quick fact: The fourth number is $25$.

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