Discussion
The number of boys in a school is 10% more than that of the girls in the school. What is the ratio of the number of boys to that of the girls in the school?
Answer: B
The ratio is 11 : 10.
If girls are 100 parts, boys are 10% more, which is 110 parts.
\[ \text{boys : girls}=110:100=11:10 \]
10 : 11 is the reverse, and 11 : 9 and 9 : 10 do not match a 10% excess.
An easy check is to choose 100 girls. Boys are 10% more, which is 110. The ratio 110 : 100 reduces to 11 : 10, with boys first, as the question asks. The reverse ratio 10 : 11 would put girls first.
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