Seventy percent of the 100 students in middle school cafeteria bought their lunch sone of the students that brought there own lu

Question

3 years ago

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Seventy percent of the 100 students in middle school cafeteria bought their lunch sone of the students that brought there own lu

nch 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

Mathematics

1 answer:

gogolik [260] · Answer 1 · 2022-03-01T20:29:55+03:00

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