In a class the ratio of the number of boys to the number of girls is 3:4 . There are 18 boys in the class. How many girls are in the class.
To find the number of girls in the class, we need to determine the ratio of boys to girls, given that there are 18 boys.
The ratio of boys to girls is given as 3:4, which means that for every 3 boys, there are 4 girls.
Since there are 18 boys, we can set up the following proportion:
3 boys / 18 boys = 4 girls / x
To solve for x, we cross multiply:
3x = 18 * 4
3x = 72
x = 72 / 3
x = 24
Therefore, there are 24 girls in the class.