Using mathematical operations and ratios, the number of questions that the other kids answered incorrectly was <u>1 each</u>.
<h3>What are the mathematical operations?</h3>
The mathematical operations include these four basic operations - addition, subtraction, multiplication, and division.
These mathematical operations and ratios, which set one value equal to another, are used to solve mathematical problems.
<h3>Data and Calculations:</h3>
The number of questions = 20
Marks awarded to each question = 3 points
Average incorrect answers by Chris = 6
Average performance = 50%
Above average performance = 90%
Incorrect answers by other students = 10% (1 - 90%)
<h3>Incorrect performance ratios:</h3>
Chris = 50%
Four students = 10%
= 5 : 1
Chris' ratio = 5/6
Four students = 1/6
The number of questions that the four other students answered incorrectly was <u>1 question</u> (6/50% x 10%) or (6 x 1/6).
Thus, the other kids answered <u>1 question</u> each incorrectly.
Learn more about mathematical operations and ratios at brainly.com/question/12024093
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<h3>Question Completion:</h3>
A test has 20 questions. The test awards 3 points if the answer is correct and takes away 1 point if the answer is incorrect. Five students took the test, but four of the five students perform above average (90%). Chris, an average student (50%), answered 6 questions incorrectly. How many questions did the other kids answer incorrectly?
