Here, you have to combine like terms. So, it is 11m-3v.
Just use your right angled triangle formula.
A=

Plug n chug
A=

A=71.5
Answer:
58%
Step-by-step explanation:
10*5=50
7*3=21
21/50 chance to choose inside small rectangle
21/50*2 = 42/100 chance to choose inside small rectangle
100-42=58%