The ratio of boys to girls at the dance was 9 to 5. how many boys were at the dance if there were 85 girls at the dance? explain how you got your answer.

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

Alicia puts $400 in a bank account. each year the account earns 5% simple interest. how much money will be in her bank account in six months?

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?