10. (10 points) There is a cup filled with a 16% saltwater solution. There are large, medium, and small iron balls, with volume ratios of 10: 4: 3. First, the small ball is submerged in the saltwater cup. As a result, 10% of the saltwater overflows, and the small ball is removed; then the medium ball is submerged in the saltwater cup and removed; next, the large ball is submerged in the saltwater cup and removed; finally, pure water is added to the cup until it is full. What is the concentration of the saltwater in the cup at this point? (保留一位小数) (保留一位小数 means "保留一位小数" in Chinese, which translates to "保留一位小数" in English. However, for clarity, I will replace it with "保留一位小数" in the final translation.)

10. (10 points) There is a cup filled with a 16% saltwater solution. There are large, medium, and small iron balls, with volume ratios of 10: 4: 3. First, the small ball is submerged in the saltwater cup. As a result, 10% of the saltwater overflows, and the small ball is removed; then the medium ball is submerged in the saltwater cup and removed; next, the large ball is submerged in the saltwater cup and removed; finally, pure water is added to the cup until it is full. What is the concentration of the saltwater in the cup at this point? (保留一位小数) 

(保留一位小数 means "保留一位小数" in Chinese, which translates to "保留一位小数" in English. However, for clarity, I will replace it with "保留一位小数" in the final translation.)

10. (10 points) There is a cup filled with a 16% saltwater solution. There are large, medium, and small iron balls, with volume ratios of 10: 4: 3. First, the small ball is submerged in the saltwater cup. As a result, 10% of the saltwater overflows, and the small ball is removed; then the medium ball is submerged in the saltwater cup and removed; next, the large ball is submerged in the saltwater cup and removed; finally, pure water is added to the cup until it is full. What is the concentration of the saltwater in the cup at this point? (保留一位小数)

(保留一位小数 means "保留一位小数" in Chinese, which translates to "保留一位小数" in English. However, for clarity, I will replace it with "保留一位小数" in the final translation.)

10. (10 points) There is a cup filled with a 16% saltwater solution. There are large, medium, and small iron balls, with volume ratios of 10: 4: 3. First, the small ball is submerged in the saltwater cup. As a result, 10% of the saltwater overflows, and the small ball is removed; then the medium ball is submerged in the saltwater cup and removed; next, the large ball is submerged in the saltwater cup and removed; finally, pure water is added to the cup until it is full. What is the concentration of the saltwater in the cup at this point? (保留一位小数)

(保留一位小数 means "保留一位小数" in Chinese, which translates to "保留一位小数" in English. However, for clarity, I will replace it with "保留一位小数" in the final translation.)

10. (10 points) There is a cup filled with a 16% saltwater solution. There are large, medium, and small iron balls, with volume ratios of 10: 4: 3. First, the small ball is submerged in the saltwater cup. As a result, 10% of the saltwater overflows, and the small ball is removed; then the medium ball is submerged in the saltwater cup and removed; next, the large ball is submerged in the saltwater cup and removed; finally, pure water is added to the cup until it is full. What is the concentration of the saltwater in the cup at this point? (保留一位小数)

(保留一位小数 means "保留一位小数" in Chinese, which translates to "保留一位小数" in English. However, for clarity, I will replace it with "保留一位小数" in the final translation.)

10. (10 points) There is a cup filled with a 16% saltwater solution. There are large, medium, and small iron balls, with volume ratios of 10: 4: 3. First, the small ball is submerged in the saltwater cup. As a result, 10% of the saltwater overflows, and the small ball is removed; then the medium ball is submerged in the saltwater cup and removed; next, the large ball is submerged in the saltwater cup and removed; finally, pure water is added to the cup until it is full. What is the concentration of the saltwater in the cup at this point? (保留一位小数)

(保留一位小数 means "保留一位小数" in Chinese, which translates to "保留一位小数" in English. However, for clarity, I will replace it with "保留一位小数" in the final translation.)

10. (10 points) There is a cup filled with a 16% saltwater solution. There are large, medium, and small iron balls, with volume ratios of 10: 4: 3. First, the small ball is submerged in the saltwater cup. As a result, 10% of the saltwater overflows, and the small ball is removed; then the medium ball is submerged in the saltwater cup and removed; next, the large ball is submerged in the saltwater cup and removed; finally, pure water is added to the cup until it is full. What is the concentration of the saltwater in the cup at this point? (保留一位小数)

(保留一位小数 means "保留一位小数" in Chinese, which translates to "保留一位小数" in English. However, for clarity, I will replace it with "保留一位小数" in the final translation.)

10. (10 points) There is a cup filled with a 16% saltwater solution. There are large, medium, and small iron balls, with volume ratios of 10: 4: 3. First, the small ball is submerged in the saltwater cup. As a result, 10% of the saltwater overflows, and the small ball is removed; then the medium ball is submerged in the saltwater cup and removed; next, the large ball is submerged in the saltwater cup and removed; finally, pure water is added to the cup until it is full. What is the concentration of the saltwater in the cup at this point? (保留一位小数)

(保留一位小数 means "保留一位小数" in Chinese, which translates to "保留一位小数" in English. However, for clarity, I will replace it with "保留一位小数" in the final translation.)

10. (10 points) There is a cup filled with a 16% saltwater solution. There are large, medium, and small iron balls, with volume ratios of 10: 4: 3. First, the small ball is submerged in the saltwater cup. As a result, 10% of the saltwater overflows, and the small ball is removed; then the medium ball is submerged in the saltwater cup and removed; next, the large ball is submerged in the saltwater cup and removed; finally, pure water is added to the cup until it is full. What is the concentration of the saltwater in the cup at this point? (保留一位小数)

(保留一位小数 means "保留一位小数" in Chinese, which translates to "保留一位小数" in English. However, for clarity, I will replace it with "保留一位小数" in the final translation.)

10. (10 points) There is a cup filled with a 16% saltwater solution. There are large, medium, and small iron balls, with volume ratios of 10: 4: 3. First, the small ball is submerged in the saltwater cup. As a result, 10% of the saltwater overflows, and the small ball is removed; then the medium ball is submerged in the saltwater cup and removed; next, the large ball is submerged in the saltwater cup and removed; finally, pure water is added to the cup until it is full. What is the concentration of the saltwater in the cup at this point? (保留一位小数)

(保留一位小数 means "保留一位小数" in Chinese, which translates to "保留一位小数" in English. However, for clarity, I will replace it with "保留一位小数" in the final translation.)

10. (10 points) There is a cup filled with a 16% saltwater solution. There are large, medium, and small iron balls, with volume ratios of 10: 4: 3. First, the small ball is submerged in the saltwater cup. As a result, 10% of the saltwater overflows, and the small ball is removed; then the medium ball is submerged in the saltwater cup and removed;
【Analysis】The overflow water volume is actually the volume of the large ball, which is $10 \% \times \frac{10}{3}=\frac{1}{3}$ of the entire cup of brine. Therefore, after filling with water, the concentration becomes $\frac{16 \times\left(1-\frac{1}{3}\right)}{100}=\frac{8}{75} \approx 10.7 \%$. The answer can be derived based on this.
【Solution】Solution: $10 \% \times \frac{10}{3}=\frac{1}{3}$,
$$
\frac{16 \times\left(1-\frac{1}{3}\right)}{100}=\frac{8}{75} \approx 10.7 \% \text {, }
$$

Answer: The concentration of the brine in the cup is $10.7 \%$.