Answer:
c = b -d/a
Step-by-step explanation:
a(b-c)=d
Divide each side by a
a(b-c)/a = d/a
b-c = d/a
Subtract b from each side
b-c-b = d/a -b
-c = d/a -b
Multiply each side by -1
c = -d/a+b
10 questions = 40%
X question = 100%
40x = 1000
X = 25 questions
5o is the correct answer
