Answer:
24 g
Explanation:
In this context*, PPT means "parts per thousand", so the weight of salt is ...
(24/1000)×(1000 g) = 24 g
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* PPT is often used to mean "parts per trillion". The ambiguity between thousand and trillion, as well as the fact that "trillion" means different things in different countries, has led the National Institute of Standards and Technology (NIST) to discourage the use of that abbreviation.