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In an examination, a student scores 4 marks for every correct answer and losses 1 mark for every wrong answer. A student attempted all the 200 questions stud and scored 200 marks. Find the number of questions he answered correctly.

Correct Answer:

A) 82 |

B) 80 |

C) 68 |

D) 60 |

Correct Answer:

B) 80 |

Description for Correct answer:

Let the number of correct answers be x

and number of wrong answers be y

Then, 4x - y = 200 ...(i)

and x + y = 200 ...(ii)

On adding Eqs. (i) and (ii). we get

4x - y = 200

x + y = 200

5x = 400

Therefore, x = 80

Let the number of correct answers be x

and number of wrong answers be y

Then, 4x - y = 200 ...(i)

and x + y = 200 ...(ii)

On adding Eqs. (i) and (ii). we get

4x - y = 200

x + y = 200

5x = 400

Therefore, x = 80

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