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

Basic Arithmetic & Number SystemsAverage

There are four numbers. The average of the first three is $15$ and that of the last three is $16$. If the last number is $19$, find the first number.

A.$14$
B.$16$Correct answer
C.$18$
D.$20$

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Quick fact: The first number is $16$.

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