A dental hygiene company is creating a new 24-ounce tube of toothpaste by combining its most popular toothpastes, Cavity Crusher and Bad Breadth Obliterator. Cavity Crusher contains 0.25% of sodium fluoride as its active ingredient,and Bad Breath Obliterator contains 0.30 % of triclosan as its active ingredient for a total of 0.069 ounces of active ingredients in both toothpastes. Solving which of the following systems of equations yields the number of ounces of Cavity Crusher,c, and the number of ounces of Bad Breath Obliterator ,b, that are in the new toothpaste?