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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)
It is already in its simplest ratio because 17 is a prime number but if it were 7 boys to 21 girls then the ratio would be 1 to 3
If the ratio of boys to girls is 3:7, this means that for every 3 boys, there are 7 girls. To find out how many boys there are, you would need to divide the total number of children by the sum of the parts in the ratio (3 + 7 = 10) and then multiply that result by the number of boys' parts in the ratio (3). So, if there are 30 children in total, there would be 9 boys (30 divided by 10, times 3).
boys:girls::7:9
49 boys!