A farmer needs a 50% solution of alcohol. How many liters of pure alcohol must the farmer add to 10 liters of 40% alcohol to get the proper solution?

Question

pls answer using system of equations(Substitution or Elimination)

Answer 1

Let x + number of liters of 100% alcohol

0.40(10) + 1.00x = 0.50(x + 10)

Solve for x.