Question

If a number is added to the numerator of 7/9 and the same number is subtracted from the denominator, the result is 3. Find the number.

Answer 1

5

Explanation:

`(7+x)/(9-x)=3\\ 7+x = 3(9-x)\\7+x=27-3x\\x+3x=27-7\\4x=20\\x=5`