You would have to add 1200 and 300 to get the total amount of students which would be 1500.
Then put 1500 as the denominator and 300 as the numerator since we're talking about the number of students that did NOT wear their school colors. our fraction should then be 300/1500.
If you cross out 2 zeros on both numbers, you'll get 3/15. if you reduce that you get 1/5. 1/5= 20%
So the remaining 21.7% is the sucsess rate. 100%-21.7%=78.3% 13=78.3% of x so just solve the algebra 13=.783x basically just divide 13 by .783... ez<span />
