Answer:
john would get 1/12 of the cake
Step-by-step explanation:
need to find common denominator which would be 6 and theresa easts 3/6 and linnea eats 2/6 which is 5/6 and if felix and john share the rest 5/6 doubled is 10/12 which leaes 2 1/12 size slices left for john and felix