In an examination, you have to answer 100 questions and for each wrong answer, there will be a cut 0.4 mark from your actual marks.and your results say you get 65 marks, so how many wrong answers do you have?

Note:we get 1 mark for each right answer.

No vote yet

1 vote

×

Problem Loading...

Note Loading...

Set Loading...

Easy Math Editor

`*italics*`

or`_italics_`

italics`**bold**`

or`__bold__`

boldNote: you must add a full line of space before and after lists for them to show up correctlyparagraph 1

paragraph 2

`[example link](https://brilliant.org)`

`> This is a quote`

Remember to wrap math in \( ... \) or \[ ... \] to ensure proper formatting.`2 \times 3`

`2^{34}`

`a_{i-1}`

`\frac{2}{3}`

`\sqrt{2}`

`\sum_{i=1}^3`

`\sin \theta`

`\boxed{123}`

## Comments

Sort by:

TopNewestWhat is the mark for each correct answer?

Log in to reply

I've edited that "we get 1 mark for each right answer." although I think the mark for each right answer is not necessary to know to get the amount of wrong answers.

Log in to reply

Assuming we get 1 mark for each right answer before deduction, and let the number of questions wrongly answered be \(x\). Then we have

\(\begin{align} (100-x)-0.4x & =65 \\ 1.4x & = 35 \\ \implies x & = 25 \end{align}\)

Log in to reply

@Chew-Seong Cheong Thanks a lot,now I understand it and If we say "we get 2 marks for each right answer" then the result of the number of questions wrongly answered will stay the same?I think the mark for each right answer is not necessary to know to get the amount of wrong answers

Log in to reply

200-x-0.4x=65, 135=1.4x. x is not a whole number, meaning that x does matter

Log in to reply

Log in to reply

Log in to reply

Log in to reply

Log in to reply

Log in to reply

@Calvin Lin @Pi Han Goh @Chew-Seong Cheong

Log in to reply

What have you tried? Where are you stuck?

Log in to reply

I was stuck at the beginning,didn't know how to start.

Log in to reply