pls tell how you calculated it
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Anny121:
its a good q.
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Total marks = 25 x 4 = 100
Student scored 50 by attempting 20 questions.
Imagine he made x correct & y incorrect.
X + Y = 20
4X - 2Y = 50
Solve, X = 15 & Y = 5
Verify : 15 x 4 - 5 x 2 = 50 which he scored.
Please mark brainliest
Student scored 50 by attempting 20 questions.
Imagine he made x correct & y incorrect.
X + Y = 20
4X - 2Y = 50
Solve, X = 15 & Y = 5
Verify : 15 x 4 - 5 x 2 = 50 which he scored.
Please mark brainliest
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