Answer:
r = 15
Step-by-step explanation:
I don't really have an explanation, I'm just good at quick math,
I'm sorry if you wanted an explanation, I would explain but I am really bad at explaining math.
Step-by-step explanation:
- 2+3b
25
b=books
3b
23


- 50+25L
200
L=lesson
25L
150
L
6
Hope that helps :)