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In a class of 30 students, if 9 are nine-year-old boys and 9 are nine-year-old girls, what proportion of the class is not nine years old?
  • a)
    1/3
  • b)
    2/5
  • c)
    1/2
  • d)
    3/5
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
In a class of 30 students, if 9 are nine-year-old boys and 9 are nine-...
To find the proportion of students who are not nine years old, we first calculate the total number of nine-year-olds: 9 boys + 9 girls = 18 nine-year-olds. Therefore, the number of students not nine years old is 30 - 18 = 12. The proportion is then 12/30, which simplifies to 2/5. Understanding proportions helps in analyzing data, such as demographics in a classroom.
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