Question 478270
Ms. Lopez needs to make 70 millimeters of a 25% acid solution by mixing together a 15% acid solution with a 40% acid solution. How much of each solution must she use?
-------------------
Equation:
acid + acid = acid
0.15x + 0.40(70-x) = 0.25*70
---
Multiply thru by 100 to get:
15x + 40*70 - 40x = 25*70
-25x = -15*70
x = (3/5)70
x = 42ml (amt. of 15% solution needed)
70-x = 28 ml (amt. of 40% solution needed)
================================
Cheers,
Stan H.
============