The ratio of the number of boys to the number o girls in a theater is 7:9. There are 42 boys in the theater. How many children are in the theater

In this case, the boys make up 7 parts or the ratio, and there are 42 boys. You should divide 42 by 7, giving you 6. This means that one part is 6. As the number of girls is in the ratio 7:9, you have to multiply 9 by 6, giving you 54. As you've got 42 boys and 54 girls, there are 96 children in the theatre