Question 619793
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Hi
How many milliliters {{{highlight(x)}}} of water must be added to 12 ml of a 60% salt solution 
in order to produce a 42% salt solution? Round your answer to the nearest tenth.
Note: Convert Percentages to the Amount of Water (Pure Water 100%  or 1.0)
{{{ x + .40 * 12ml = .58(12ml+x)}}}