6tractors take 8 days to collect the harvest. how long would it take 9 tractors to do the same amount of work?

5 days

Step-by-step explanation:

6 tractors = 8 days

double the tractors = half the time  

(2 x 6 tractors = x 8 days)

1.5 the tractors, means of the time

1.5 x 6 tractors = x 8 days

    9 tractors =    

                     = 5.33 days

NOTE: I really think the answer is 6 days but I could not figure out a mathematical way to get that answer.

step-by-step explanation:

given that ab is divided into equal parts as

ac, cd, de, ef, fg, gh, hi, ib.

from this we find that f is the midpoint of ab.

so using mid point formula we find

f = (3,7)

similarly considering fb, we get

h = mid point of fb = ((6,6) and g, mid point of fh is

g = (9/2, 13/2)

i is mid point of hb

so i =(15/2,11/2)