The 7th grade class experienced a 15% decrease in enrollment. Last year, the 7th grade class had 280 students. How many students are enrolled in the 7th grade class this year?

238 students are enrolled in the 7th grade class this yearSolution:  Given that Percentage decrease in number of students enrolled in 7th grade = 15% Number of students enrolled last year = 280  Need to determine number of students enrolled in 7th grade this year. Lets assume number of students enrolled this year = x  Percentage decrease in enrollment = (Number of student enrolled last year – Number of students enrolled this year) whole divided by number of students enrolled last year multiplied by 100 [tex]\begin{array}{l}{\Rightarrow 15=\frac{280-x}{280} \times 100} \\\\ {=>15 \times 280=28000-100 x} \\\\ {=>100 \mathrm{x}=28000-4200=23800} \\\\ {\Rightarrow x=\frac{23800}{100}} \\\\ {\Rightarrow x=238}\end{array}[/tex]Hence number of students enrolled this year = 238.