1. Stating the problem: We are given that 12 sheets of thick paper weigh 40 grams, and we need to find how many sheets weigh 1 gram. 2. Find the weight of one sheet by dividing the total weight by the number of sheets: $$\text{weight per sheet} = \frac{40}{12} = \frac{10}{3} \approx 3.33 \text{ grams}$$ 3. To find how many sheets weigh 1 gram, divide 1 gram by the weight of one sheet: $$\text{number of sheets} = \frac{1}{\frac{10}{3}} = \frac{1 \times 3}{10} = \frac{3}{10} = 0.3$$ 4. Interpretation: Since 0.3 sheets is not a whole sheet, it means less than one sheet weighs 1 gram. So, one sheet weighs more than 1 gram, and it's impossible to have a whole sheet weighing exactly 1 gram. Final answer: Approximately 0.3 sheets weigh 1 gram, or practically, no whole sheet weighs just 1 gram.