I did it for you I was at my moms and my dad and my mom and I were talking to
Answer:

Explanation:
Mass of one tablet = 20 mg
Mass of two tablets = 
Percent that is soluble in water = 40%
Mass of tablet that is soluble in water = 
So, mass of solute is 
Density of water = 1 kg/L
Volume of water = 1 L
So, mass of 1 L of water is 
PPM is given by

Hence, the concentration of iodine in the treated water
.
Because of the sun reflects onto the moon and makes it brighter.
Gamma rays have the highest penetrating power so it can only be stopped by thick layers of dense metal. :)
Some examples:
- the sun
- a flashlight turned on
- a light bulb
- stars
- fireflies
...hope i helped :)