The ratio of boys to girls in a class is 6 to 5. How many girl students are there if there are 30 boys?
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boys 18
girls 15
To find the number of girl students in the class, we need to determine the ratio of boys to girls and use that ratio along with the given number of boys to calculate the number of girls.
In the given problem, the ratio of boys to girls is 6 to 5. This means that for every 6 boys, there are 5 girls.
Given that there are 30 boys, we can set up a proportion to determine the number of girls.
Let "x" represent the number of girls in the class.
So, we can set up the proportion as follows:
6 boys / 5 girls = 30 boys / x girls
To solve this proportion, we can cross-multiply:
6x = 5 * 30
6x = 150
To isolate "x" (the number of girls), divide both sides of the equation by 6:
x = 150 / 6
x = 25
Therefore, there are 25 girl students in the class.
6/5 = 30/x
Cross multiply and solve for x.