Multiple choice

In a classroom, the ratio of the number of girls to that of boys is 3 : 4. The average height of students in the class is 4.6 feet. If the average height of the boys in the class is 4.8 feet, then what is the average height of the girls in the class?

  1. Less than 4.2 feet

  2. More than 4.2 feet but less than 4.3 feet

  3. More than 4.3 feet but less than 4.4 feet

  4. More than 4.4 feet but less than 4.5 feet
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let the number of girls be 3k and boys be 4k. Total students = 7k. Total height = 7k * 4.6 = 32.2k. Total height of boys = 4k * 4.8 = 19.2k. Total height of girls = 32.2k - 19.2k = 13k. Average height of girls = 13k / 3k = 4.33 feet.

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