Ican't figure out how to solve this

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

Which strategy is used by public health to reduce the incidence of food poisoning?

Select the point that is a solution to the system of inequalities. y< =-x+3 y=x^(2)-3x