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Verified Answer :

The answer is 21.

All you have to do is answer the following question:
What times 8 is equal to 24?
24/8=3 so 83=24
The answer to the question is 3.
Now, if you multiply 8
3 to get 24, then you must multiply 73 to get your numerator
7
3=21
Hope this helps :)

7 21
_ = _
8 24 because 8x3=24, and 7x3=21.