Question

7. In a test conductd at Akash Institute, one mark is awarded for each correct answer while half mark is deducted for every wrong answer. Aashwi answered 120 questions and got 90 marks. How many questions did she answered correctly ?

( Ans: 100 )

Class 10

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Answer 1

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Difficulty Level : Above Average

Chances of being asked in Board : 70%

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Let the number of correct answers be x

Then number of incorrect answers will be (120 - x)

Then ATQ,

x - (120 - x)/2 = 90

$= > \frac{2x - 120 + x}{2} = 90$

=> 3x - 120 = 180

=> 3x = 300

=> x = 100 <<<<<< Answer

Thus the number of correct answer are 100

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