SOLUTION: how many litres of 10% solution of acid should be added to 20 litres of a 60% solution of acid to obtain a 50% solution?

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Question 462097: how many litres of 10% solution of acid should be added to 20 litres of a 60% solution of acid to obtain a 50% solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how many litres of 10% solution of acid should be added to 20 litres of a 60% solution of acid to obtain a 50% solution?
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Equation:
acid + acid = acid
0.10x + 0.60*20 = 0.50(x+20)
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Multiply thru by 100 to get:
10x + 60*20 = 50x + 50*20
40x = 10*20
x = 5 litres (amt. of 10% solution needed)
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Cheers,
Stan H.