How do I perform this operation and simplify the answers? I tried it multiple times and I got the answers different each time so I am not sure how to do it

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

Timmy uses 1 1 2 cups of sugar for every 2 gallons of lemonade he makes. how many cups of sugar would timmy use if he makes 13 gallons of lemonade?