Mom bakes a cake. Dad ate 1/6 of the cake. Brother ate 1/5 of what was left. Then sister had 1/4 of the remaining cake. After that the dog ate 1/3 of the remaining cake, and finally another kid ate 1/2 of what was left after the dog had finished. What fraction of the whole cake is left for mom to eat?

Answer
1/6 – the same amount everyone else got to eat.