Please help me in this I really need this

Ben wants to play a carnival game that costs $2. in his pocket he has 5 red tickets worth 35 cents each, and 15 blue tickets worth 10 cents each. which of the following systems of inequalities correctly represents the constraints on the variables in this problem? let represent the red tickets and b represent the blue tickets.

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Rounded to the nearest tenth, what is the value of x