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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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