ninety percent of the ninth grade students at richbartville high school.take algebra. if 450 ninth grade student take algebra, how many ninth grade student are at richbartville high school?

Answer: There are 500 ninth grade students at Richbartville high school. Step-by-step explanation: Let be "x" the number of ninth grade students that are at Richbartville high school. You know that the number of ninth grade students take algebra is 450 and this amount represents the 90% of the the ninth grade students at Richbartville high school. Knowing this, you can set up the following proportion: [tex]\frac{90}{450}=\frac{100}{x}[/tex] The final step is to solve for "x" in order to find its value. This is: [tex](x)(\frac{90}{450})=100\\\\x=(100)(\frac{450}{90})\\\\x=500[/tex] Therefore, there are 500 ninth grade students at Richbartville high school.