Question 1031892
 In a chemistry class, 8 liters of a 4% silver iodide solution must be mixed with a 10 % solution to get a 6% solution. How many liters of the 10% solution are needed?
------
Quantity Eq:: 8 + t = s
Iodide Eq:: 0.32 + 0.10t = 0.06s
-----------------------------------------
Substitute for "s" and solve for "t"::
0.32 + 0.10t = 0.06(8 + t)
32 + 10t = 48 + 6t
4t = 16
t = 4 liters (amt. of 10% solution needed)
-----
Ans: B
-----
Cheers,
Stan H.
-----------
 
A) 5.0 L
B) 4.0 L
C) 8.0 L
D) 3.0 L