John builds a box. The box is 26 inches by 26 inches by 14 inches. The walls are 1 inch thick on each side. How much is the internal volume in cubic feet? Give the rationale and then the answer.
Let's think step by step. The walls take away 2 * 1 = 2 inches from each dimension. So the longer sides are 26 - 2 = 24 inches. That is 24 / 12 = 2 feet. The smaller dimension is 14 - 2 = 12 inches. That is 12 / 12 = 1 foot. So the internal volume is 2 * 2 * 1 = 4 cubic feet.. The answer is: 4.

Elias uses a bar of soap every month. If each bar of soap costs $4, how much does he spend on bars of soap in two years? Give the rationale and then the answer.
Let's think step by step. A year is 12 months, so Elias spends 4 * 12 = $48 per year on bars of soap. In two years, he spends 2 * 48 = $96 on bars of soap.. The answer is: 96.

Kantana loves chocolate. Every Saturday she goes to the candy store and buys 2 chocolates for herself and 1 for her sister. This last Saturday she picked up an additional 10 chocolates as a birthday gift for her friend Charlie. How many chocolates did Kantana end up buying for the month? Give the rationale and then the answer.
Let's think step by step. There is 1 Saturday in a week and there are 4 weeks in a month so there are 1 * 4 = 4 Saturdays in a month (on average). If Kantana buys herself 2 chocolates every Saturday then this means she buys 2 * 4 = 8 chocolates for herself for the month. Kantana also buys her sister 1 chocolate on these trips so she is picking up an additional 1 * 4 = 4 additional chocolates for her sister for the month. Kantana decided to also purchase some chocolates for her friend Charlie for his birthday. She bought Charlie 10 chocolates. This means that for the month she bought 10 chocolates for Charlie, 4 chocolates for her sister, and 8 chocolates for herself, 10 + 4 + 8 = 22 chocolates bought in total for the month.. The answer is: 22.