Option B is the expression that does NOT answer the question.
What is an equivalent expression?
An equivalent expression is an expression that has the same value but does not look the same. When you simplify an expression, you're basically trying to write it in the simplest way possible.
For the given situation,
Let the unknown number be x or 1/x
Option A) 2 1/2 divided by 8
If unknown number is x,
then, 8x = 2 1/2
⇒ x = 2 1/2 ÷ 8
So, option A is correct.
Option B) 5/2 x 1/8
⇒ [tex]\frac{(5)(1)}{(2)(8)}[/tex]
⇒ 5/16
So, option B is incorrect.
Option C) 8 divided 2 1/2
If unknown number is 1/x,
then, 8/x = 2 1/2
⇒ x = 8 ÷ 2 1/2
So, option C is correct.
Option D) ? x 8 = 2 1/2
If fraction is not known, it can be replaced by '?'
So, option D is correct.
Hence we can conclude that option B is the expression that does NOT answer the question.
Learn more about equivalent expression here
https://brainly.com/question/11326971
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