A chemist is mixing a 30% salt solution with a 20% salt solution to make 35 L of a new solution that will contain 25% salt. How much of the 30% solution should the chemist use?
1 answer:
Answer:
17.5 L
Step-by-step explanation:
x L of 30% solution , has 0.30x salt
35 L of 25 % solution, has (0.25*35) salt
(35 - x)L 20% solution, has 0.20*(35 - x) salt
Mass of salt before mixing = mass of salt after mixing
0.3x + 0.2(35 - x) = 0.25* 35
0.3 x + 7 - 0.2x = 8.75
0.1x = 8.75 -7
0.1x = 1.75
x = 17.5 L
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