Answer:
The number of boys are 64.
Explanation:
We have,
The ratio of the boy to girl is 8:9.
Total number of girls are 72.
Let total boys are 8x and total girls are 9x.
According to the question,
![9x=72\\\\x=8](https://img.qammunity.org/2021/formulas/mathematics/college/b7d5r47ic11g8q06e5yce9gnsjwmlozmua.png)
Since, number of boys are 8x. So,
![B=8x=8* 8=64](https://img.qammunity.org/2021/formulas/mathematics/college/rjhf6n6wsa4av52m2cb5yt82z4b3bvrcvc.png)
So, the number of boys are 64.