The average age of 30 boys is 5 years more than the average age of 20 girls.…
2025
The average age of 30 boys is 5 years more than the average age of 20 girls. The total age of the boys is twice the total age of the girls. What is the total age of the girls?
- A.
400
- B.
600
- C.
300
- D.
450
Attempted by 13 students.
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Correct answer: C
Let the average age of girls be g. Then boys' average is g + 5. Total boys' age = 30(g + 5), and total girls' age = 20g. Given boys' total is twice girls' total: 30(g + 5) = 40g, so g = 15. Total age of girls = 20 x 15 = 300.