Step-by-step reasoning process: The 20 big toenails take up as much space as 40 regular toenails because 20 x 2 = 40. She has filled up 80 toenails worth because 40 + 40 = 80. She can fit 20 regular toenails in the jar because 100 - 80 = 20.
The question and answer:
Question and answer: Hilary is collecting her toenails in a jar to gross out her sister. She can fit 100 toenails in the jar, unless they are from her two big toes, which are twice as big as the rest. She has already filled it with 20 big toenails and 40 regular toenails. How many regular toenails can she fit into the remainder of the jar?
The answer is 20

Step-by-step reasoning process: After buying the toy, Isabel has 204 / 2 = 102 dollars left. Isabel has 102 / 2 = 51 dollars left.
The question and answer:
Question and answer: Isabel has $204 in her piggy bank. She spent half the amount and bought a toy. She then spent half of the remaining money and bought her brother a book. How much money, in dollars, was left over?
The answer is 51

Step-by-step reasoning process: Tony's age now is 24 / 2 = 12 years old. In 6 years he will be 12 + 6 = 18 years old.
The question and answer:
Question and answer:
Jacob is 24 years now. His brother Tony is half Jacob's age. In 6 years how old will tony be?
The answer is 18