Hi everyone I need help in determining the the number of children that went to the restaurant how would I do that?

The Hungry Heifer diner offers an all-you-can-eat buffet at $25.90 per adult and $17.90 per child. On a particular day, the diner had total buffet revenue of $6,609.40 from 266 customers.

How many customers were children?

Adults $25.90

Child $17.90

Total customers 266

Revenue $6 609.40

Thanks any help would be appreciated