Answers

2016-03-28T19:38:46+08:00
    ratio of girls to boys   is      12:15        =   4:5
    the ratio of boys to girls   is    15:12   =  5: 4
     when you say that the ratio of girls to boys is   5:4
     you are actually saying that there are 5 girls to every 4 boys
           which is wrong
           so it is wrong to say that the ratio of girls to boys   is  5:4
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2016-03-28T22:43:35+08:00
We have 12 GIRLS, and 15 BOYS. The ratio would be 12:15 or 4:5. So 5:4 is wrong since it is supposed to be 4:5.
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