Question

In a test. +3 marks are given for every correet answer and -1 mark
are glven for every incorrect answer. Sona attempted all the questions
and scored +20 marks though she got 10 correct answers.
How many Incorrect answers has she altempted?
How many questions were given in the test?
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Answer 1

Answer:

let total question be x

therefore

3(10)-1(x-10)=20

30-x+10=20

20=x

total question =20

Incorrect answers she altempted=20-10=10

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