Question 183089
1.moonshine has 50 liters of a 70% alcohol solution. How many liters of pure alcohol must be added to obtain an 80% alcohol solution?
---
Equation:
active + active = active
0.70*50 + 1.00x = 0.80(50+x)
solve for "x"
--------------------

2.how many kg of pure salt must be added to 20 kg of a 10% salt solution to obtain a 25% salt solution 
---
Equation:
active + active = active
0.10*20 + 1.00x = 0.25(20+x)
solve for "x"
---------------------

3. how much pure acid must be added to 6 ml of a 5% acid solution to produce a 40% acid solution?
---
Equation:
active + active = active
0.05*6 + 1.00x = 0.40(6+x)
solve for "x"
======================
Cheers,
Stan H.