Expain why this problem cannot be solved by subtracting 2/3- 1/3

lauren has 2/3 of a foot of ribbon. she cuts off 1/3 of an inch ribbon. how much ribbon does lauren have now

from the figure we get,

the x axis shows   the months and,

the y-axis shows the number of satisfied customer.

each line or each cell in upward direction (y-axis) shows 500.

the appropriate scale for the y - axis is: -

a = 2000 customers

b = 4000 customers

c = 6000 customers

d = 8000 customers

e = 10000 customers

f = 12000 customers

g = 14000 customers