<span>Each pepper shaker has 7/80 kilograms of pepper.
First, determine how much black pepper Brian distributed to all the pepper shakers. Do this by multiplying 7/10 by 7/8.
7/10 * 7/8 = 49/80
Now divide 49/80 by 7 to get the amount of pepper in each shaker. Division is the same as multiplication by the reciprocal, so multiply by 1/7. So
49/80 * 1/7 = 49/560 = 7/80
So each pepper shaker has 7/80 kilograms of pepper.</span>