B= 91
You can simply figure out this answer by using PEMDAS. If you look at the numbers and answers you already have, you will simply have an equation of, b=4(25)-9, because those numbers indicate the letter you already have.
Then, you will figure this out by bringing in your pemdas. In PEMDAS, you do parentheses first, so you would multiply 4 and 25.
Lastly, you will subtract this, to equal out an answer of “B=91”.
Hope that helped!! :)