SOLUTION: If you have a solution that's 40% alcohol and another that's 70% alcohol how much of the 70% alcohol do you have to add to the 40% to make the 40% raise to 50% alcohol. Start with

SOLUTION: If you have a solution that's 40% alcohol and another that's 70% alcohol how much of the 70% alcohol do you have to add to the 40% to make the 40% raise to 50% alcohol. Start with

Algebra.Com

Question 358540: If you have a solution that's 40% alcohol and another that's 70% alcohol how much of the 70% alcohol do you have to add to the 40% to make the 40% raise to 50% alcohol. Start with 100 ml of the 70% solution?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
.70*100+.40X=.50(100+X)
70+.40X=50+.50X
.40X-.50X=50-70
-.10X=-20
X=-20/-.10
X=200 ml. OF THE 40% ALCOHOL IS USED.
PROOF:
.70*100+.40*200=.50(100+200)
70+80=.5*300
150=150
RELATED QUESTIONS
if you have a 40% alcohol solution and a 70% alcohol solution, how much of each do you... (answered by stanbon)

If you have 1000ml of a solution that's 16% alcohol and another that's 96% alcohol how... (answered by josgarithmetic)

If you have a solution that's 16% alcohol and another that's 96% alcohol how much of the... (answered by stanbon)

You need a 30% alcohol solution. On hand, you have a 440 mL of a 5% alcohol mixture. You... (answered by josgarithmetic)

You need a 65% alcohol solution. On hand, you have a 25 mL of a 10% alcohol mixture. You... (answered by josgarithmetic)

You need a 65% alcohol solution. On hand, you have a 15 mL of a 25% alcohol mixture. You... (answered by ikleyn)

You need 390 mL of a 80% alcohol solution. On hand, you have a 70% alcohol mixture. How... (answered by richwmiller)

You need a 70% alcohol solution. On hand, you have a 30 mL of a 30% alcohol mixture. You... (answered by ankor@dixie-net.com)

You need 600 mL of a 45% alcohol solution. On hand, you have a 30% alcohol mixture. You... (answered by ikleyn,amalm06,richwmiller)