8. Chelsea buys 8 packs of markers.
   Each pack contains the same number
   of markers. Chelsea gives 10 markers
   to her brother. Then, she has 86
   markers left. How many markers
   were in each pack?

To find out how many markers were in each pack, we can use a bit of algebra! Chelsea starts with 8 packs of markers, let’s call the number of markers in each pack “x”. Thus, she begins with 8x markers. After giving away 10 markers to her brother, she has 86 left. We can set up the equation:

8x - 10 = 86.

Now, by adding 10 to both sides, we have:

8x = 96.

Finally, dividing both sides by 8 gives us:

x = 12.

So, there are 12 markers in each pack. Voilà!