posted by jonathan .
there are 50 question in a test. a student gains 2 marks for a correct anwser and loses 1 mark otherwise. if a student has 76 marks, how many question did he answer incorrectly?
This is fairly easy just use alittle more effort and someone will check your answer.
i = # incorrect (or otherwise) answers
c = # correct answers
i + c = 50
-1 + 2c = 76
Solve the two equations simultaneously.
Post your work if you get stuck.
Check my thinking. Check my work.