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Question 1/1 Expert Mathematics Quadratic Equations 5. Word Problems and Applications Class 10 Level 41

एक परीक्षा में कुल (30) प्रश्न हैं। सही उत्तर पर (4) अंक मिलते हैं और गलत उत्तर पर (1) अंक कटता है। एक छात्र ने सभी प्रश्न किए और (85) अंक पाए। सही उत्तरों की संख्या क्या है?

An exam has (30) questions. A correct answer gives (4) marks and a wrong answer deducts (1) mark. A student attempts all questions and scores (85). How many answers are correct?

Explanation opens after your attempt
Correct Answer

C. (23)

Step 1

Concept

Let correct answers be (x), so wrong answers are (30-x), and (4x-(30-x)=85). This is a linear check inside applications, giving (x=23).

Step 2

Why this answer is correct

The correct answer is C. (23). Let correct answers be (x), so wrong answers are (30-x), and (4x-(30-x)=85). This is a linear check inside applications, giving (x=23).

Step 3

Exam Tip

सही उत्तर (x) हों, तो गलत (30-x) होंगे और (4x-(30-x)=85)। यह रैखिक जाँच वाला अनुप्रयोग है, इसलिए (x=23)।

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