Problems on Numbers - Quantitative Aptitude (MCQ) questions for Q. 791

Q.  In an entrance exam, 3 marks is awarded for every correct answer and (-1) for every wrong answer. If a student gets 38 marks after attempting all questions, find the number of questions answered correctly if the total questions were 70.
- Published on 06 Jul 15

a. 38
b. 40
c. 27
d. 43

ANSWER: 27
 
Let x be the number of questions answered correctly. Hence, number of questions whose answer were wrong = (70 – x)
3*x + (70 – x)*(-1) = 38
4x = 38 + 70 = 108
x = 27

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