Definition of «substitution amount»

The phrase "substitution amount" refers to the quantity or value of something that is used to replace or substitute something else.

And if yes, what would be the right substitution amount? (simplyquinoa.com)
and this is the best substitution amounts I have found. (homemademommy.net)
What would be the substitution amount if you were to use coconut flour? (heyketomama.com)
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