Math, asked by leezaahid7932, 11 months ago

In an examination, a student scores 9 marks for every correct answer and loses 4 marks for every wrong answer. If he attempts in all 130 questions and secures 533 marks, what is the number of questions attempted correctly ?

Answers

Answered by abchelper52

2

Answer:

a = correct answers

b = wrong answers

a+b=130

9a - 4b = 533

4a+4b=520

9a-4b=533

(4b and -4b cancel)

13a=1053

a=1053/13

a=81

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