SOLUTION: Please translate the problem into a pair of linear equations in two vaiables. Solve the equations using either elimination or substitution. State your answer for the specified vari

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons  -> Linear Equations Lesson -> SOLUTION: Please translate the problem into a pair of linear equations in two vaiables. Solve the equations using either elimination or substitution. State your answer for the specified vari      Log On


   

Question 295804: Please translate the problem into a pair of linear equations in two vaiables. Solve the equations using either elimination or substitution. State your answer for the specified variable.
A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 7% cement should he mix with 10 bags of 15.5% cement to produce a mix containing 12% cement? (Please help) Thanks!!

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
y=10
x+y=x+10
10*.155+.07x=.12*(x+10)
x=7 bags of 7%