In a chemistry class, 5 liters of a 4%-saline solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed±

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This video does an EXCELLENT job teaching this topic: https://www.brightstorm.com/d/math/s/algebra/u/word-problems-using-systems-of-equations/t/percent-concentrations/e/percent-concentrations-problem-2/activeTab/1 You can probably figure out how to solve this problem after watching this video but here's a hint: amt*conc.+amt*conc.=mix amt*conc. 5L*4+x*10=(5L+x)*6