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primary 6 | Maths
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Daniel
Daniel

primary 6 chevron_right Maths

Does anyone know how to attempt this question?

Date Posted: 6 years ago
Views: 386
ything
Ything
6 years ago
Since final score is 119, the number of correct answers has to be at least 24 (24 X 5 = 120) and there must be at least 1 wrong answer (if no wrong answer, total score should be in multiples of 5). However, it cannot be 24 as there will be at least 1 wrong answer (120-2=118).

If 25 correct answers, it would be 125 marks for correct answers. To get 119, there is 3 wrong answers (125-6=119).

If 26 correct answers, it would be 130 marks for correct answers. But this is invalid as cannot get 119 since wrong answers is subtraction in multiples of 2.

If 27 correct answers, it would be 135 marks for correct answers. To get 119, it has be to 6 wrong answers (135-16=119). Hence, this is also invalid.

Do not consider more than 27 as you need more wrong answers to get 119 as total score.

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LIU SHAOMIN
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