Find the difference 11 1/9 -3 2/3 simplest form

The answer to this question is 7 4/9
to find this you first have to find the LCM (in this case it is 9) then you have to figure what you multiplied by to get to your LCM (9) whatever you do to the bottom you have to do to the top and that is how you end up with your numerator (the top number in a fraction) usually if you have the same denominators (the bottom number in a fraction) you can +/- like normal. sometimes though you can't (like this case) because you can't take a bigger number away from a smaller one.
if you would like to know how to subtract mixed numbers/fractions like this please write me a private letter on my profile. hope this helped. :

The answer is 6 weeks