Question

In a test +4 marks are given for every correct answer and (-2) mark is given for every wrong answer. Sona attempted all the questions and scored +20.If she made 10 answers correct ,find the number of answers that she made wrong

Answer 1

Answer:

10 wrong answers

Step-by-step explanation:

let x = correct ans

let y = wrong ans

4x - 2y = 20

4(10) -2y = 20

2y = 40 - 20 = 20

y = 10

10 wrong answers

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