<PRE><B>Question 781543</B>
How any milliliters of 15% acid should be mixed with 150 milliliters of 40% acid to make 35 % mixture solution
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Equation:
acid + acid = acid
0.40*150 + 0.15x = 0.35(150+x)
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40*150 + 15x = 35*150 + 35x
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5*150 = 30x
x = 5*5 = 25 ml (amt. of 15% solution needed)
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Cheers,
Stan H.
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A: write an equation 
B: solve for x
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