Uh do you mean he earned $225 per week?
If yes, then he earned 45 per day.
I’m not exactly sure what you mean by “write it in math,” however I can tell you what I think.
4y=x
(It says that x is 4 times the value of y which means that y times 4 is x.)
It would cost $4.50 to purchase 2 books.
