Jun Heng's answer to Unicorn's Secondary 3 E Maths Singapore question.
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Marks awarded for correct answer = 3(n+8) = 3n+24
Number of incorrect answer = 2n–(n–8) = 2n –n+8 = n+8
Marks deducted for incorrect answer = (–1)(n+8) = –n–8
Total marks obtained = –n–8+3n+24 = 2n+16
2n+16 > 40
2n > 24
n > 12
2n+16 < 50
2n < 34
n < 17
12 < n < 17
Number of incorrect answer = 2n–(n–8) = 2n –n+8 = n+8
Marks deducted for incorrect answer = (–1)(n+8) = –n–8
Total marks obtained = –n–8+3n+24 = 2n+16
2n+16 > 40
2n > 24
n > 12
2n+16 < 50
2n < 34
n < 17
12 < n < 17
Date Posted:
1 year ago
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