<PRE><B>Question 211626</B>
How much pure dye must be added to 4 gal of a 25% dye solution to increase the solution to 40% ?
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Equation:
dye + dye = dye
0.25*4 + x = 0.40(4+x)
1 + x = 1.6 + 0.4x
0.6 = 0.6x
x = 1 gal (amt. of 100% dye that must be added)
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Cheers,
Stan H.
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