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secondary 2 | Maths
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secondary 2 chevron_right Maths chevron_right Singapore

need help with this question, thank u in advance

Date Posted: 3 years ago
Views: 614
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AC Lim
AC Lim
3 years ago
Let correct answer = x
Wrong answer = y
Therefore,
x+y = 30
y = 30-x→①
5x -2y ≤ 66→②
Sub ① into ②,
5x -2(30-x) ≤ 66
5x -60 + 2x ≤ 66
7x ≤ 126
x ≤ 18.
Max answer correct = 18.

See 1 Answer

Let correct answer = x
Wrong answer = y
Therefore,
x+y = 30
y = 30-x→①
5x -2y ≤ 66→②
Sub ① into ②,
5x -2(30-x) ≤ 66
5x -60 + 2x ≤ 66
7x ≤ 126
x ≤ 18.
Max answer correct = 18.

Hope this helps
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AC Lim
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