Multiple choice

The average age of boys in the class is twice the number of girls in the class. If the ratio of the boys and girls in the class of 36 be 5 : 1 ,what is the total of the ages of the boys in the class

  1. 420 years

  2. 196 years

  3. 490 years

  4. 360 years
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total students = 36. Ratio boys:girls = 5:1. Boys = 30, Girls = 6. Average age of boys = 2 * number of girls = 2 * 6 = 12. Total age of boys = 30 * 12 = 360 years.

AI explanation

In a class of 36 students with a ratio of boys to girls of 5 to 1, the number of boys is 5 divided by 6 of 36, which equals 30, and the number of girls is 6. The average age of the boys is twice the number of girls, making it 12 years. Multiplying this average by the 30 boys gives a total age of 360 years.

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