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The question asks to determine the number of boys in a school play based on the given ratio of boys to girls and the total number of children.

The ratio of boys to girls is 3:7, and the total number of children is 30. 

### Step-by-Step Solution:
1. **Total parts in the ratio**: The total number of parts in the ratio \( 3:7 \) is:
   \[
   3 + 7 = 10 \text{ parts}
   \]
2. **Number of children per part**: The total number of children is 30, so each part represents:
   \[
   \frac{30}{10} = 3 \text{ children per part}
   \]
3. **Number of boys**: The boys correspond to 3 parts in the ratio, so the number of boys is:
   \[
   3 \times 3 = 9
   \]
   
Thus, there are **9 boys** in the school play.

Would you like more details on any part of this solution, or do you have further questions? Here are some related questions you could explore:

1. How many girls are there in the school play?
2. If there were 40 children, how many boys would be in the play with the same ratio?
3. What happens if the ratio of boys to girls changes to 4:5 but the total remains 30?
4. Can you generalize a formula to find the number of boys given any total number of children and a boy-to-girl ratio?
5. How would the solution change if the total number of children was unknown?

**Tip**: When solving ratio problems, always begin by determining the total number of parts in the ratio and then calculate how much each part represents relative to the total.

The ratio of boys to girls in a school play is 3:7. If there are 30 children in total, how many boys are there?

Learn how to solve a problem involving the ratio of boys to girls in a school play. The ratio of boys to girls is 3:7, and the total number of children is 30. Find out how many boys are in the play using ratio and proportion concepts. Suitable for Grades 6-8.

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