Nothing crazy here. Solve 1 step inequalities with addition and subtraction the same way you would solve an equation. solate the variable by performing the opposite operation to both sides

Of 400 people at the school carnival, 95% are students and the rest are teachers. a. how many students are at the school carnival? b. if 55% of the students at the school carnival are boys, how many are girls? c. how many teachers are at the school carnival? d. if 35% of the teachers are male and the rest are female, how many female teachers are at the carnival?