Answer:
of Diana's clothes are black or white
Explanation:
In order to find the total amount of Diana's clothes that are black or white, you need to add the fractional amount of clothes that are white (1/6) and the fractional amount that are black (7/12). But, when you add fractions they need to have the same denominator, so you need to find the least common multiple of both denominators, in this case '12':

So,

Now, simplify:
