144 students enter a spelling bee,but only 1/6 of the group will make into the semi-final round, and only 2/3 that group will ma
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Let be the number of liters of the 10% solution to be used, and
the number of liters of the 4% solution. The chemist wants to end up with a 4 liter solution, so
For each liter used in the mixture, a concentration of either 10% or 4% acid will be contributed, and the goal is to make a 4L solution whose concentration is 7%, which means
Solving for gives
, so 2L of both solutions is needed.