I know that ADD can start as early as childhood. I was diagnosed when I was about 16 years of age and my doctor told me that I had ADD way before I was ever diagnosed. So the answer to your question: Can ADD start at 15? Yes it can
45
15+15+15+15=60
15 add 20 = 35
7 + 15 + 28 = 50
We suggest to start with 15 lbs of salt and then test the water. Ideal will 3400 ppm. Usually we suggest to add 290 lbs of salt for a 10,000 gallon pool if the pool does not have any chlorine. By that reference you should add 29 lbs. But we think start with 15 lbs and increase as needed is a good idea.
15
add 9 add 1 subtract 20 add 9 add 1
try punch start first...
Start from the left.
Add 15 to itself. Add another 15. Keep adding 15. Multiples are multiple additions.
They add up to 7/15 pus 2/15 = 9/15 or 3/5 in its simplest form
19