PERCENTAGE
Level
pending
In an examination of n questions, a student replied 15 out of the 20 questions correctly .of the remaining questions,he answered one-third correctly .all the questions have the same credit .if the student gets 50% marks ,the value of n is:
The answer is 50.
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1 solution
LET N BE THE NUMBER OF PROBS CORRECT=15, (THE DATA MENTIONED 15 OUT 20 IS IRRELEVANT @ THIS STAGE. OUT OF THE BALANCE, 1/3 IS CORRECT = 1/3(N-20) TOTAL CORRECT IS 50%=1/2N AS EACH Q HAS 1 MARK ASSUME THEREFORE EQUATION WILL BE 15+ 1/3 (N-20)=1/2N SOLVING FOR N=50