18 ആളുകള് 36 ദിവസം കൊണ്ട് ചെയ്തു തീര്ക്കുന്ന ഒരു ജോലി 12 ആളുകള് എത്ര ദിവസം കൊണ്ട് ചെയ്ത് തീര്ക്കും ?
A40
B72
C54
D28
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