Question:medium
The combined mean age of a group of boys and girls in a school is 12. If the mean of the boys in that group is 14 and the mean of the girls is 9, then the percentage of boys in that group is
The combined mean age of a group of boys and girls in a school is 12. If the mean of the boys in that group is 14 and the mean of the girls is 9, then the percentage of boys in that group is
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Logic Tip: Use the Alligation Method for a much faster solution. Write the boys' mean (14) and girls' mean (9) on the top, and the combined mean (12) in the center. The ratio of boys to girls is the diagonal differences: $(12 - 9) : (14 - 12) = 3 : 2$.
Updated On: Apr 27, 2026
- 24%
- 36%
- 40%
- 60%
- 85%
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The Correct Option is D
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