Given:
- Total questions: \(75\)
- Marks for a correct answer: +3
- Marks for a wrong answer: -1
- Marks for an unattempted question: +1
Definitions:
\(C\) = Number of correct answers
\(W\) = Number of wrong answers
\(U\) = Number of unattempted questions
Formulated Equations:
\(C + W + U = 75 \quad \text{(Equation 1)}\)
\(3C - W + U = 97 \quad \text{(Equation 2)}\)
Also given: \(U>C + W\)
Step 1: Isolate \(U\) from Equation 1
\(U = 75 - C - W\)
Step 2: Substitute \(U\) into Equation 2
\(3C - W + (75 - C - W) = 97\)
\(2C - 2W + 75 = 97\)
\(2C - 2W = 22\)
\(C - W = 11 \quad \text{(Equation 3)}\)
Step 3: Analyze the inequality
Given: \(U>C + W\)
Substitute \(U\) from Equation 1: \(75 - C - W>C + W\)
Rearrange: \(75>2C + 2W\)
Simplify: \(37.5>C + W\)
Therefore: \(C + W<38 \quad \text{(Equation 4)}\)
Step 4: Solve for \(W\) and \(C\) using Equations 3 and 4
From Equation 3: \(C = W + 11\)
Substitute this into Equation 4: \((W + 11) + W<38\)
\(2W + 11<38\)
\(2W<27\)
\(W<13.5\)
Since \(W\) must be an integer, the maximum value for \(W\) is 13.
Calculate the maximum value for \(C\) using \(C = W + 11\). When \(W = 13\), \(C = 13 + 11 = 24\).
Final Result:
The maximum number of correct answers Rayan could have obtained is 24.
Correct Option: 24