SOLUTION: In a multiple choice test, two marks are given for each correct answer and one mark is deducted for every incorrect answer. If a pupil answers 20 questions and gets 25 marks, how m

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: In a multiple choice test, two marks are given for each correct answer and one mark is deducted for every incorrect answer. If a pupil answers 20 questions and gets 25 marks, how m      Log On


   

Question 1017637: In a multiple choice test, two marks are given for each correct answer and one mark is deducted for every incorrect answer. If a pupil answers 20 questions and gets 25 marks, how many correct answers were there
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
In a multiple choice test, two marks are given for each correct answer and one mark is deducted for every incorrect answer. If a pupil answers 20 questions and gets 25 marks, how many correct answers were there
-----
c + w = 20 questions
2c- w = 25 marks
---------------
Add and solve for "c"
3c = 45
c = 15 (# of correct answers)
-------
Cheers,
Stan H.
----------