Answer:
9 boys in the school play
Step-by-step explanation:
Given that the ratio of boys to girls in the school play is 3:7, and there are a total of 30 students, we can find the number of boys by following these steps:
1. Calculate the total parts in the ratio: 3 (boys) + 7 (girls) = 10 parts in total.
2. Determine the value of each part: Total students / Total parts = 30 students / 10 parts = 3 students per part.
3. Calculate the number of boys: 3 parts (boys) * 3 students per part = 9 boys in the school play. Therefore, there are 9 boys in the school play.
