SOLUTION: A student took a test composed of 10 questions, with correct answers worth 5 points. If the student received 30 points for his grade, how many questions were correct? I know the a

Algebra ->  Percentages: Solvers, Trainers, Word Problems and pie charts -> SOLUTION: A student took a test composed of 10 questions, with correct answers worth 5 points. If the student received 30 points for his grade, how many questions were correct? I know the a      Log On


   

Question 684001: A student took a test composed of 10 questions, with correct answers worth 5 points. If the student received 30 points for his grade, how many questions were correct?
I know the answer is 6 but how do I put it in an exquation
Answer by rapaljer(4671) About Me  (Show Source):
You can put this solution on YOUR website!
For an equation, why don't you set up a ratio:

Let x = number of questions



Now, a%2Fb=c%2Fd means that ad=bc.

5%2F1=30%2Fx means that 5x=30

Now, solve for x by dividing both sides by 5:
x=6


Dr. Robert J. Rapalje, Retired
Seminole State College of Florida

www.mathinlivingcolor.com.