In a competitive examination, one mark is awarded for each correct answer while 1/2 mark is deducted for every wrong answer. Jayanti answered 120 questions and got 90 marks. How many questions did she answer correctly
Solution:
Consider the number of correct answers to be x.
Consider the number of wrong answers to be (120 - x).
According to the given condition,
x × 1 - (120 - x) × 1/2 = 90.
Now solve for x.
x - 6 + x/2 = 90
3x/2 = 150
x = 150 × 2/3
x = 300/3
x = 100.
Therefore, Jayanti answered 100 questions correctly.
✦ Try This: In a competitive examination, one mark is awarded for each correct answer while 1/ 2 mark is deducted for every wrong answer. Jayanti answered 150 questions and got 120 marks. How many questions did she answer correctly
☛ Also Check: NCERT Solutions for Class 10 Maths Chapter 3
NCERT Exemplar Class 10 Maths Exercise 3.3 Problem 21
In a competitive examination, one mark is awarded for each correct answer while 1/2 mark is deducted for every wrong answer. Jayanti answered 120 questions and got 90 marks. How many questions did she answer correctly
Summary:
In a competitive examination, one mark is awarded for each correct answer while 1/ 2 mark is deducted for every wrong answer. Jayanti answered 120 questions and got 90 marks. Jayanti answered 100 questions correctly
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