Question

what number must be added to both numerator and denominator of 16/21 to make the resulting fraction equal to 5/6?

Answer 1

9 because 16 plus 9 is 25 and 21 plus 9 is 30. now you have 25/30
Now you have to simplify:

25 divided 5 is 5 and 30 divided 5 is 6. So 5/6