Seventy percent of the 100 students in middle school cafeteria bought their lunch sone of the students that brought there own lunch leave the cafeteria to attend a assembly now only 60% of the remaining students bought their lunch how many students are remaining in the cafeteria
so we solve for each 70% of 100=70 students who didn't buy lunch=100-70=30
some of the 70 left so that the students who bought lunch, are 60% of those who are left we know that the students who didn't buy lunch didn't change number so therefor 100% of students left-60%=40%= students that didn't buy lunch=30 so 40%=30 20%=15 100%=75 there were 75 students lfet in the cafeteria
