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A type of chemical solution is 6% sodium chloride and 21% ammonium hydroxide. The sodium chloride and ammonium hydroxide are therefore in the ratio 6 to 21 or, equivalently, 2 to 7. Chemists made different amounts of the solution. Let S be an unspecified number of grams of sodium chloride, which can vary, and let A be the corresponding number of grams of ammonium hydroxide in this type of chemical solution. Reason about quantities and use math drawings to help you find and explain three different equations that relate S and A (and do not include any other variables).
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