Question

If a number is added to the numerator of 7/8 and the same number is subtracted from the denominator, the result is 4. Find the number.

Answer 1

The number is 5.

Explanation:

Call the number n. Write the problem as an equation:

`(7+n)/(8-n)=4\\7+n=(8-n)4=32-4n\\5n = 25\\n=5`

The number is 5.