How to write an inequality relating the given side lengths

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

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?