SOLUTION: https://answers.yahoo.com/question/index?qid=20200126204008AAysseK

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Question 1151666: https://answers.yahoo.com/question/index?qid=20200126204008AAysseK
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

Let 'a' be the amount of solution A (in liters)
Let 'b' be the amount of solution B (in liters)
Solution | Concentration | Acetic+Acid
--------------------------------------------------
... a ...... | ...... 8% ......... | 0.08a
... b ...... | ...... 20% ....... | 0.20b
Final solution:
... 4 ..... | ...... 11% ........ | 4%280.11%29+=+0.44
Write two equations:
a+%2B+b+=+4
0.08a+%2B+0.20b+=+0.44
Multiply the last equation by 100+to get rid of decimals:
8a+%2B+20b+=+44
Divide everything by 4 to simplify:
2a+%2B+5b+=+11
Solve the first equation for one variable, say a:
a+=+4+-+b
Substitute into the last equation:
2%284+-+b%29+%2B+5b+=+11
8+-+2b+%2B+5b+=+11
3b+=+11+-+8
3b+=+3
b+=+3%2F3
b+=+1
Then solve for+a:
a+=+4+-+1
a+=+3