SOLUTION: 2/5 of the students are boys. there are 12 girls. how many students in all?

Algebra ->  Algebra  -> Percentage-and-ratio-word-problems -> SOLUTION: 2/5 of the students are boys. there are 12 girls. how many students in all?      Log On

Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help!
Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations!

   

Question 475411: 2/5 of the students are boys. there are 12 girls. how many students in all?
Answer by Tatiana_Stebko(1326) About Me  (Show Source):
You can put this solution on YOUR website!
if 2%2F5 of the sudents are boys, then 1-2%2F5=3%2F5 of the students are girls
Have ratio
3%2F5-12
1-x
Equation
%283%2F5%29x=12 multiply by 5
3x=12%2A5
3x=60 divide by 3
x=60%2F3
x=20 students in the group