SOLUTION: One solution is 16 % acid and another is 2 % acid. How many cubic centimeters of each should be mixed to obtain 100 cubic centimeters of a solution that is 7 % acid? Round answe

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Question 901622: One solution is 16 % acid and another is 2 % acid. How many cubic centimeters of each should be mixed to obtain 100 cubic centimeters of a solution that is 7 % acid?
Round answers to the nearest integer.
Found 2 solutions by josgarithmetic, richwmiller:
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
The question is faulty, but you are looking for something like this:

u is how much 2% acid, v is how much 16% acid:
%282%2Au%2B16%2Av%29%2F100=7 and u%2Bv=100

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
x+y=100,
0.02*x+0.16*y=0.07*100
0.02*x+0.16*y=7
x=100-y
0.02*(100-y)+0.16*y=7
2-0.02y+0.16*y=7
0.14*y=5
y=35.7142857 at 16%
x=100-y
x=64.2857143 at 2%
check
0.02*64.2857143+0.16*35.7142857=0.07*100
1.28571429+5.71428571=7
7.0=7
ok