1. **State the problem:** We know that 7 tubes of toothpaste weigh 8 kg in total. We need to find the weight of 8 tubes. 2. **Write the formula:** If the weight of one tube is $w$, then the total weight of 7 tubes is $7w = 8$ kg. 3. **Find the weight of one tube:** $$ 7w = 8 $$ Divide both sides by 7: $$ \cancel{7}w = \frac{8}{\cancel{7}} $$ So, $$ w = \frac{8}{7} \text{ kg} $$ 4. **Find the weight of 8 tubes:** $$ 8w = 8 \times \frac{8}{7} = \frac{64}{7} \text{ kg} $$ 5. **Simplify the answer:** $$ \frac{64}{7} \approx 9.14 \text{ kg} $$ **Final answer:** The weight of 8 tubes of toothpaste is approximately $9.14$ kg.