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To solve this problem, we'll apply the identity property of multiplication, which states that any number multiplied by 1 remains unchanged.
Let's explore this property in the given context:
We have the equation .
According to the identity property, for the product to remain 27, the missing number must be 1, because .
Thus, the solution to the problem is to identify as 1.
Therefore, the solution to the problem is .
1
\( 20:1= \)
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