A biology teacher has 15 milliliters of a salt solution that is 65% salt. How many milliliters of water must the teacher add to
make a solution that is 25% salt?
1 answer:
Assuming that water has 0% salt and that the amount of water added is x ml;
(15+x)*25 = (15+0)*65 = 975
375+25x = 975
25x = 975-375 = 600
x = 600/25 = 24 ml
The teacher must add 24 ml of water.
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