Answer:
0.94 grams of salt.
Explanation:
Hayley had 3.93 grams of salt.
She added more salt to the sample and now has 4.87 grams.
Let she added x grams of salt.
3.93 + x = 4.87
x = 4.87 - 3.93
x = 0.94 grams
Hayley added 0.94 grams of salt.
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