which of the following numbers should replace the denominator in order to add fractions 25/82 + 13/?
A.13
B.28
C.82
D.25
The answer is C. 82.
To add fractions, the denominators must be the same. Since the first fraction has a denominator of 82, we need to find another fraction with a denominator of 82. Therefore, the denominator that should replace the question mark is 82.