If 10 tractors can plough 1/6th of a field in 12 days,
how many days 20 tractors will take to do the re-
maining work?
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TOTAL WORK = 1
WORK DONE 1/6
REMAINING = 5/6
NO. OF TRACTORS WE'VE = 20
DAYS = (5/6)/X × 20
= 5/6X × 20
X= 100/6
X= 16.67 DAYS
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