77 students ratio girls to boys is 7:4, how many girls
7/11 = x/77
Cross multiply and solve for x.
To find the number of girls in a group with a given ratio, you need to use the proportion method:
1. Start by adding up the parts of the ratio. In this case, the ratio is 7:4, so there are 7 + 4 = 11 parts in total.
2. Divide the total number of students by the number of parts to find the value of each part. In this case, 77 divided by 11 equals 7.
3. Multiply the value of each part by the number of parts representing girls in the ratio. In this case, since the ratio is 7:4, there are 7 parts representing girls. Multiplying 7 by 7 gives you 49.
Therefore, there are 49 girls in a group of 77 students, with a ratio of 7:4.