Question 1144706
A scientist has two solutions, which she has labeled Solution A and Solution B. Each contains salt. She knows that Solution A is 65% salt and Solution B is 90% salt. She wants to obtain 70 ounces of a mixture that is 80% salt. How many ounces of each solution should she use?
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Assuming there is some compound that can be 90%, or even 65%, in some solvent, which I doubt:
"Salt" is not necessarily NaCl.  There are a lot of salts.
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A + B = 70 --- total solution
65A + 90B = 70*80  ----  total salt
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etc