To make things easier just say M=1. b/c M could be .99999999999999999999999999999999999999999999999 etc...
5+3M<=10. We can make M=1 and N=1.65 and this still holds.
4N+4M<10> 4(1) + 4*(1.65) > 10. WE can obviously think of values to make this work.
So this is insuff.
essentially 10/11>=N or .909...>=N To make things easier just say N =.9
Now 5*.9 + 3M<10> 4.5+3M<=10 3M<=5.5 M<=1.83....
Now: 4(.9) + 4(1.83) is greater than 10. We can also think of values that would satisfy this inequality.
Nothing new. B gives us more information than A and B is insuff.
So I say E for this one.
This prob was not hard, just very tedious and I prolly would have guessed b/c this was way too time consuming w/ all the long division and all. Would have done what I could in 2 min or so (unless I am very close to the answer) click and move on.