SOLUTION: there are 3/5 students in class that are female and 12 are male how many students in the class

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Question 992370: there are 3/5 students in class that are female and 12 are male how many students in the class
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

let the number of students in class be x=female%2Bmale
if there are 3%2F5 students in class that are female, we have female=%283%2F5%29x
and male=12 are male, then
x=%283%2F5%29x%2B12.....solve for x
x-%283%2F5%29x=12
5x%2F5-3x%2F5=12
2x%2F5=12
2x=12%2A5
x=%28cross%2812%296%2A5%29%2Fcross%282%291
x=6%2A5
x=30

female=%283%2F5%29x =>female=%283%2Fcross%285%29%29cross%2830%296 =>female=18
so, there are 30 students in the class, 18 female and 12 male students