ഒരു ജോലി ചെയ്ത് തീർക്കാൻ 16 പേർക്ക് 30 ദിവസം വേണം. എന്നാൽ 20 ദിവസം കൊണ്ട് പൂർത്തിയാക്കാൻ എത്ര പേരെ കൂടുതൽ നിയമിക്കണം?
A8
B10
C12
D6
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