NEEEDD HEEELLP!
Pure acid is to be added to a 5% acid solution to obtain 95L of 62% solution. What amounts should be used of each?
How many liters of 100% pure acid should there be used to make a solution

Question

NEEEDD HEEELLP!
Pure acid is to be added to a 5% acid solution to obtain 95L of 62% solution. What amounts should be used of each?
How many liters of 100% pure acid should there be used to make a solution

anonymous · Answer

@undeadknight26

aum · Answer

Assume x liters of 100% pure acid is added to y liters of 5% acid solution to get 95 liters of 62% solution.  Then,
x + y = 95  ---- (1)
x + 0.05y = 95*0.62  or
x + 0.05y = 58.9  ---- (2)

Eliminate y and solve for x from equations (1) and (2).