Carla's sheepdog rounded up 90% of her sheep, but the remaining 10% wandered off into the hills. If there are 81 sheep in the pen, how many are out in the wilderness?
A step-by-step solution is:
9
First find the total number of sheep by dividing the number rounded up by 90%: 81 sheep /.

9 = 90 sheep.

Then multiply that number by 10% to find the number that are in the hills: 90 sheep * 10% = 9 sheep.

.

The answer is 9