Mark has a collection of marbles. 3/8 of these marbles are black and the rest are blue. What is the ratio of black to blue balls?

To find the ratio of black to blue marbles in Mark's collection, we can follow these steps:

1. **Fraction of Black Marbles:**  
   The problem states that \(\frac{3}{8}\) of the marbles are black.

2. **Fraction of Blue Marbles:**  
   The rest of the marbles are blue. Therefore, the fraction of blue marbles is:  
   \[
   1 - \frac{3}{8} = \frac{8}{8} - \frac{3}{8} = \frac{5}{8}
   \]

3. **Ratio of Black to Blue Marbles:**  
   The ratio of black marbles to blue marbles is:
   \[
   \text{Ratio} = \frac{3/8}{5/8} = \frac{3}{5}
   \]

So, the ratio of black to blue marbles is **3:5**.

Would you like more details or have any questions?

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Here are some related questions you might be interested in:

1. If Mark has 80 marbles in total, how many are black?
2. What is the ratio of blue marbles to the total number of marbles?
3. If Mark gives away 10 black

Learn how to calculate the ratio of black to blue marbles in Mark's collection. This problem involves fractions and ratios, where 3/8 of the marbles are black and the rest are blue. Suitable for students in Grades 6-8.

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