Final mixture: 90oz of 85% salt:
Find the 85% of 90 to know the ounces of salt in the final mixture:
If A is the ounces of solution A and B the ounces of solution B, the sum of A and B is equal to 90oz:
The quantity of salt in solution A is 0.7A, the quantity of salt in solution B is 0.95B. The sum of 0.7A and 0.95B needs to be 76.5 (Total quantity of slat in the final mixture):
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Use the next system of linear equations to find A and B:
1. Solve A in the first equation:
2. Substitutet he A in the second equation by the value you get in step 1:
3. Solve B:
4. Use the value of B to find A:
Then, to get a final mixture of 90oz of 85% salt you use 36 ounces of solution A and 45 ounces of solution B