Question

Kyra observed that 85% of the students at a library liked reading mystery stories. If 30 students at the library did not like reading mystery stories, the number of students at the library who liked mystery stories was _____. (only put numeric values, no other symbols)

Answer 1

if 30 students is 15%, then 5% is 10 students because you divide 3 from both sides. 5% times 20 is 100%, so 10 times 20 is 200. there is a total of 200 students. 200 - 30 is 170.

Answer 2

Out of the 100% of students at the library, 85% liked mystery stories, so that means 15% didn't like them. 

this means that 170 students liked mystery stories, out of 200