To find the difference between 87 and 12 12, we need to convert 12 12 to an improper fraction.
12 12 = (12 x 2 + 12) / 2 = 36/2 + 12/2 = 48/2 = 24
Now we can subtract the fractions:
87 - 24/12 = 87 - 2 = 85
Therefore, the difference between 87 and 12 12 is 85.