HELP ME!!!!!!!!!!!!!!!!!!

some one has to help me im going insane!!!! i have been working on a brainteaser for a week and i am without three answers and it is getting on my nerves!!!!!!

if any one can help i will be eternally gratefull!!!

here goes:-
a few examples to help you get the drift-

if 4 L on a C -- 4 Legs on a Chair
3 S of a T-- 3 Sides of a Triangle
8 F, 2 T and 10 T on the H B-- 8 Fingers, 2 Thumbs and 10 Toes on the Human Body
32 D F at which W F-- 32 Degrees Fahrenheit at which Water Freezes.
26.2M = D of L M -- 26.2 Miles = Distance of London Marathon

heres the ones i need help on:-

9 N of J on the S C --
9 N on A T C --
20 L D IN J

please help me!!!!!!!!!!!!!!