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

Time, Work & Distance ProblemsWork and Time

21 binders can bind 1400 books in 15 days. How many binders will be required to bind 800 books in 20 days?

A.$7$
B.$9$Correct answer
C.$12$
D.$15$

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Quick fact: The required number of binders is $9$.

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