<PRE><B>Question 403138</B>
Bob has to mix a solution of .67 herbicide and .46 herbicide to form 42 liters of a .55 solution. How much .67 solution does Bob use?
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Equation:
cide + cide = cide
0.67x + 0.46(42-x) = 0.55(42)
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Multiply thru by 100 to get:
67x + 46*42 - 46x = 55*42
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21x = 9*42
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x = 18 liters (amt. of 0.67 solution needed)
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cheers,
stan H.
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