MATH
posted by Anonymous .
A pharmacist mixed some 10%saline solution
with some 15%saline solution to obtain 100 mL of a 12%saline solution. How much of the 10%saline solution did the pharmacist use in the mixture?
A 60 mL
B 45 mL
C 40 mL
D 25 mL CAN SOME GIVE AN EQUATION TO HELP MY SOLVE THIS PROBLEM THIS IS THE ONLY WAY TO SOLVE THis problem

x ml of 10% >0.1 x salt
(100x ml) of 15% > 0.15(100x) salt
total salt = .1x + 15  .15x = 15.05x salt
so
15.05x = .12(100) = 12
3 = .05x
x = 60 ml