What is the complement of 13 degrees

With #! i’ve tried to figure it out but i can’t.

The jurassic zoo charges $14 for each adult admission and $5 for each child. the total bill for 77 people from a school trip was $565. how many adults and how many children went to the zoo? i

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.