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If a student answered 90% of the questions correctly in an exam of 200 questions

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Question: If a student answered 90% of the questions correctly in an exam of 200 questions, how many questions did the student answer incorrectly?

Options:

  1. 10
  2. 20
  3. 15
  4. 25

Correct Answer: 20

Solution: 

If 90% were answered correctly, then 10% were answered incorrectly. Therefore, the number of incorrect answers is 10% of 200, which is 20.

If a student answered 90% of the questions correctly in an exam of 200 questions

Practice Questions

Q1
If a student answered 90% of the questions correctly in an exam of 200 questions, how many questions did the student answer incorrectly?
  1. 10
  2. 20
  3. 15
  4. 25

Questions & Step-by-Step Solutions

If a student answered 90% of the questions correctly in an exam of 200 questions, how many questions did the student answer incorrectly?
  • Step 1: Understand that the student answered 90% of the questions correctly.
  • Step 2: Calculate the percentage of questions answered incorrectly. Since 100% - 90% = 10%, the student answered 10% incorrectly.
  • Step 3: Find out how many questions 10% of 200 is. To do this, multiply 200 by 10% (or 0.10).
  • Step 4: Calculate 200 * 0.10 = 20.
  • Step 5: Conclude that the student answered 20 questions incorrectly.
  • Percentage Calculation – Understanding how to calculate a percentage of a total quantity.
  • Basic Arithmetic – Performing simple arithmetic operations to find the number of incorrect answers.
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