SOLUTION: A farmer plough his land in 12 days if He uses 5 tractor s. How long will it take if He uses only 3

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Question 1191291: A farmer plough his land in 12 days if He uses 5 tractor s. How long will it take if He uses only 3
Found 3 solutions by josgarithmetic, ankor@dixie-net.com, greenestamps:
Answer by josgarithmetic(39618) About Me  (Show Source):
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r, the rate for just 1 tractor
Five tractor rate is 5r; 5r%2A12=1

For 3 tractors, x number of days.
5r%2A12=3r%2Ax=1

5%2A12=3x

x=%285%2A12%29%2F3

highlight%28x=20%29

Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
A farmer plough his land in 12 days if He uses 5 tractor s.
How long will it take if He uses only 3
:
5 * 12 = 60 tractor-days to do the job
3d = 60
d = 20 days with 3 tractor

Answer by greenestamps(13200) About Me  (Show Source):
You can put this solution on YOUR website!


Common sense tells us that 3/5 as many tractors means 5/3 as many days.

(5/3)*12=60/3=20

ANSWER: 20 days