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Question
Two different schools, A and B, have the same number of students. The ratio of the boys in school A and the boys in school B is 2:1 and the ratio of the girls in school A and the girls in school B is 4:5. What is the ratio of the boys in school A to the girls in school A?
1:2
2:3
3:4
4:5
None of these
ANSWER : 1
Descrption
<p style="margin-left:0px;">school A has a boys and b girls, and school B has c boys and d girls, then</p><p style="margin-left:0px;">a/c = 2/1<br>b/d = 4/5<br>a+b = c+d<br><br>we want to find a/b<br><br>a = 2c<br>5b = 4d<br><br>a-c = d-b<br>a-(a/2) = (5b/4)-b<br>a/2 = b/4<br>a/b = 2/4 = 1/2</p>
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