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## Question

primary 6 | Maths
| Measurement

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Then, she answered 1/5 of the questions wrongly. So that's 1 unit worth of questions.

1 - 1/5 = 4/5

So 4/5 of the questions were answered correctly. That's 4 units worth of questions.

For every question answered correctly,

5 marks were awarded.

So since 4 units worth of questions were answered correctly, marks awarded

= 4 units x 5 marks

= 20 units worth of marks

For every question answered wrongly,

2 marks were deducted. You can treat this as though -2 marks were awarded.

So since 1 unit worth of questions were

answered wrongly, marks awarded

= 1 unit x -2 marks

= -2 units worth of marks

So her total score

= 20 units worth of marks - 2 units worth of marks

= 18 units worth of marks

And we know her total score was 216 marks.

So 216 marks = 18 units worth of marks.

1 unit = 216 ÷ 18 = 12

So in 1 unit , there are 12 questions.

Total number of questions

= 5 units

= 12 questions x 5

= 60 questions

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