The two-way frequency table below shows data on twins in a patient's family history and pregnancies with twins for pregnancies Dr. Ward has attended. Plz help me I'm stuck on this question

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?

: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?