Custom Queuing - Percentages

Experts,

I apologize in advance if this has been covered before. I found something
similar in the archives, but I still don't really get it.

I am working on a lab for Custom Queuing. On Task 2 I am trying to
configure different queues for different percentages of bandwidth. For
example:

Queues 1, 2, 3 10%
Queues 4, 5 20%
Queue 6 30%

The way it is explained each queue by default has a byte-count of 1500.
There are 17 queues (counting Queue 0). So my thinking would be to total
this 1500 x (17 -1) (I subtracted queue 0 there) to get the total and then
divide these among the queues that are being used (giving the requisite
percentage to each queue as required).

However the book explains that a byte-count of 1500 is 10%, so I would give
Queues 1, 2 and 3 1500, queue 4 and 5 3000 and queue 6 4500...this is what I
don't get. Why is this 10%? Is this just a reference? Also when I
configure only 6 queues what happens to the other queues? Are they not used
because I did not give them a percentage of bandwidth?

-- 
Steven
--Confidence is stain they can't wipe off...-Lil Wayne
Blogs and organic groups at http://www.ccie.net