27.5% of x=11 x is the number of people 27.5%=.275 x=11/.275=40 people in the survey participated
the answer is option e. *answer needs to be 20 characters long this should do :)
5a(b-c)=d. Here, we are trying to isolate the variable b.
Divide both sides by 5a: b-c=d/(5a)
Add c to both sides: b=