SOLUTION: How much 2% acid must be added to 12% acid to get 50 ml of 10% acid?

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Question 899726: How much 2% acid must be added to 12% acid to get 50 ml of 10% acid?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
a+b=50,
0.02*a+0.12*b=0.1*50
a=50-b
0.02*(50-b)+0.12*b=5
1-0.02b+0.12*b=5
0.1*b=4
b=40
a=50-b
a=10 b=40
check
0.02*10+0.12*40=0.1*50
0.2+4.8=5
5=5
ok