If 1m = 3.3ft, it means that to find how many meters there are in a foot we do:
m * ft = x
m = amount in meters
ft = equivalent amount in feet
x = result
Therefore, to find the amount of meters in a foot:
ft / m = x
ft = amount in feet
m = equivalent amount in meters
x = result
Now we apply the formula to our case:
66 / 3.3 = 20
Answer:

Hope it helped,
BioTeacher101