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Class 10MathematicsQuadratic EquationsWord Problems and ApplicationsExpertLevel 41
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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?

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Answer and explanation

Correct answer: (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).

Related tags

Quadratic EquationsExam ApplicationMarks

Frequently asked questions

What is the correct answer to this question?

(23)

Why is this the correct answer?

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).

Which subject and chapter does this question cover?

This is a Class 10 Mathematics question. Chapter: Quadratic Equations. Topic: Word Problems and Applications.

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10 more MCQs
  1. 1The square of a number is 6 more than 5 times the number. If the number is x, what is the equation?
  2. 2The product of two consecutive positive integers is (72). What is the smaller integer?
  3. 3The product of two consecutive positive integers is (132). What is the larger integer?
  4. 4A rectangle has length (3) cm more than its breadth and area (70) square cm. What is the breadth?
  5. 5A rectangle has breadth (6) m and area (96) square m. If its length is (x) m, which equation is correct?
  6. 6A square garden has area (169) square m. What is its side?
  7. 7A square field has area (225) square m. What is its perimeter?
  8. 8A number multiplied by its next integer gives (56). What is the number?
  9. 9The square of a positive number is (24) more than (5) times the number. What is the number?
  10. 10The square of a positive number is (45) more than (4) times the number. What is the number?
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