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number of boys = ratio of boys x total strength / total ratio = 5 x 27/9 = 5 x 3 = 15 number of girls = ratio of girls x total strength / total ratio = 4 x 27/9 = 4 x 3 = 12 verification: 15 + 12 = 27
If the boy to girl ratio in the class is 3:5, this means that for every 3 boys, there are 5 girls. To find the number of boys in the class, you need to divide the total number of students by the total parts of the ratio (3+5=8) to get the value of each part. Then multiply this value by the number of parts representing boys (3) to find the number of boys. Therefore, in a class of 24 students, there would be 9 boys (24/8=3, 3x3=9).
5:9, dumb question!
the trick for working ratio and proportions out is to,eg, say if there 5 girls in a class and the ratio of how many boys was 5:1 there will be 25 boys because you simply have to do 5x5=25 then simply times it by one .i think
Ex.) The ratio of boys to girls in the class was 7:5 (meaning there are 7 boys and 5 girls. If it was girls to boys it would be 5:7). Or you could write it as showed below: 7 to 5 7/5(as a fraction)