SOLUTION: Hi I have a math problem I have no clue about I'm not good at percentages but the question is "in ms. Perrons class, 75% of the students were boys. There are 18 boys in the class.

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: Hi I have a math problem I have no clue about I'm not good at percentages but the question is "in ms. Perrons class, 75% of the students were boys. There are 18 boys in the class.       Log On


   

Question 961056: Hi I have a math problem I have no clue about I'm not good at percentages but the question is "in ms. Perrons class, 75% of the students were boys. There are 18 boys in the class. What is the total number of students in ms. Perrons class?" Thanks
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +n+ = the total number of students in the class
+.75n+ = number who were boys
+.75n+=+18+
+n+=+18%2F.75+
+n+=+24+
There are 24 students in the class
check:
The girls have to be 25% of the class
There are +24+-+18+=+6+ girls in the class
+6%2F24+=+1%2F4+
+1%2F4+=+.25+
25% are girls
OK