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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)

math arithmetic
 Aug 13, 2014

Best Answer 

 #1
avatar+3454 
+8

First, we need to find the total number students at the library.

30 people did not like reading mystery stories, and that is 15% of the people.

15% of the total people = 30         --Let's have x equal the total number of students.

15% of x = 30

.15*x = 30         ---Divide both sides by .15

x = 200

 

200 people is the total amount of students. 85% of them like mystery stories.

85% of the total amount of people = people that like mystery stories      --Let's have y = people that like mystery stories

85% of the total amount of people = y

85% of 200 = y

.85*200 = y

170 = y

 

170 people like mystery stories.

 Aug 13, 2014
 #1
avatar+3454 
+8
Best Answer

First, we need to find the total number students at the library.

30 people did not like reading mystery stories, and that is 15% of the people.

15% of the total people = 30         --Let's have x equal the total number of students.

15% of x = 30

.15*x = 30         ---Divide both sides by .15

x = 200

 

200 people is the total amount of students. 85% of them like mystery stories.

85% of the total amount of people = people that like mystery stories      --Let's have y = people that like mystery stories

85% of the total amount of people = y

85% of 200 = y

.85*200 = y

170 = y

 

170 people like mystery stories.

NinjaDevo Aug 13, 2014

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