Write an expression for "7xr

Question and answers are in the attached picture. you so much in advance.

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

How many bananas are in a fruit bowl that has 200 total apples and bananas if there are 31 bananas for every 93 apples