<PRE><B>Question 386243</B>
A 400 gram solution is 25% salt. How much salt must be added to produce a solution that is 40% salt?
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Quantity:  x  +  y = 400
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Salt Eq:: 0.25x + y = 0.40*400
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Multiply Quantity thru by 25
Multiply Salt by 100
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25x  +  25y =  25*400
25x  + 100y =  40*400
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75y = 15*400
y = 80 gram (amt. of salt that must be added)
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Cheers,
Stan H.
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